Title of Invention: Over-the-door hanging apparatus Abstract: An apparatus for hanging an article from a door. In one aspect, the apparatus can include a mounting system that can be used to hang a mirror, piece of art, or other article from a door without the need for a screw driver or any other tools. The mounting system may include one or more elongate members that are hung from a top edge of the door and that include mounting elements that mount to separate mounting elements that are secured to the article. The mounting may be achieved via one or more of relative rotation of the elongate members and the article and relative horizontal translation of the elongate members and the article. The inventive apparatus may permit multiple hanging heights for individualized optimization. Detailed Description: Part general_description_paragraphs: Part CROSS-REFERENCE TO RELATED PATENT APPLICATIONS: The present application is a continuation of U.S. patent application Ser. No. 15/084,102, filed Mar. 29, 2016, which: (1) claims the benefit of U.S. Provisional Patent Application Ser. No. 62/216,703, filed Sep. 10, 2015; and (2) is a continuation-in-part of U.S. patent application Ser. No. 14/747,656, filed Jun. 23, 2015, now U.S. Pat. No. 9,386,867, which is a continuation-in-part of U.S. patent application Ser. No. 14/300,834, filed Jun. 10, 2014, now U.S. Pat. No. 9,060,627, which is a continuation of U.S. patent application Ser. No. 14/028,839, filed Sep. 17, 2013, now U.S. Pat. No. 8,746,644, which is a continuation of U.S. patent application Ser. No. 12/915,747, filed Oct. 29, 2010, now U.S. Pat. No. 8,534,627, which claims the benefit of U.S. Provisional Patent Application Ser. No. 61/334,914, filed May 14, 2010. The entirety of each of the above-referenced applications is incorporated herein by reference. Part FIELD: The present invention relates to an over-the-door hanging apparatus. Part BACKGROUND: Mirrors are used often in everyday life. For example, the first thing that a person does after waking up is go to the bathroom and look at him or herself in the mirror. Furthermore, people also typically look at themselves in the mirror prior to leaving the house to make sure that they are pleased with their appearance. A very common room in the home for a person to desire to have a mirror is in the bedroom or the bathroom. However, there is not always a good place to put a mirror in those rooms. Therefore, it has been known to hang a mirror on a wall or on the back of a door by using adhesives, screws, nails or hangers. Doors have been widely used to support mirrors because they provide convenient available space, because they may be removed to facilitate mounting of the mirror, and because they avoid the necessity of placing wall anchors in plaster or drywall. In addition to mirrors, people are often desirous to hang other articles or objects on the back of a door in order to conserve space while still enjoying the benefits of the article. For example, people may desire to hang a painting, picture or some other framed article from the back of a door. Depending on the person's needs and the space that the person has available, a person may desire to hang any object that may otherwise be hung or attached to a wall from a door instead. Typical hangers that enable a user to hang a mirror or other article on the back of a door require a user to assemble the hanger onto the rear of the mirror or other article by screwing, gluing or otherwise attaching the hanger directly onto the rear of the mirror or other article. This type of an installation requires a screw driver or glue, which a user or consumer does not always have available. Furthermore, in the case of a screw-type assembly, even if the user has a screwdriver, the user may find it difficult to force the screw into the rear of the mirror or other article because the mirror or other article typically does not have pilot or pre-drilled holes. Thus, a need exists for an apparatus and/or system that can be used to hang a mirror, piece of art, or other article to a door without the need for a screw driver or any other tools. A need also exists for an apparatus and/or system that enables a user to hang a mirror, piece of art, or other article from a door in a matter of seconds without the need for excessive physical force and with the ability to adjust its hanging height. Part SUMMARY: The present invention may be directed, in one aspect, to an over-the-door hanging apparatus comprising: a support structure extending along a longitudinal axis and having a rear surface; a first mounting element pair coupled to the rear surface of the support structure, the first mounting element pair comprising a first mounting element and a second mounting element, each of the first and second mounting elements comprising a curved channel; a first elongate member comprising a first surface, an opposite second surface, a first mounting element and a second mounting element protruding from the first surface of the first elongate member, and a first bracket protruding from the second surface of the first elongate member for engaging a top edge of a door; the support structure and the first elongate member coupled together by simultaneously: (1) rotating the first mounting element of the first elongate member through the curved channel of the first mounting element of the first mounting element pair; and (2) rotating the second mounting element of the first elongate member through the curved channel of the second mounting element of the first mounting element pair In another aspect, the invention can be an over-the-door hanging apparatus comprising: a support structure extending along a longitudinal axis and having a rear surface; a first mounting element pair coupled to the rear surface of the support structure, the first mounting element pair comprising a first mounting element and a second mounting element, each of the first and second mounting elements comprising a horizontally elongated channel; a first elongate member comprising a first surface, an opposite second surface, a first mounting element and a second mounting element protruding from the first surface of the first elongate member, and a first bracket protruding from the second surface of the first elongate member for engaging a top edge of a door; the support structure and the first elongate member coupled together by: (1) inserting the first mounting element of the first elongate member into the horizontally elongated channel of the first mounting element of the first mounting element pair and inserting the second mounting element of the first elongate member into the horizontally elongated channel of the second mounting element of the first mounting element pair; and (2) horizontally translating one of the first elongate member and the support structure relative to the other so that the first and second mounting elements of the first elongate member move horizontally within the horizontally elongated channels. In yet another aspect, the invention can be an over-the-door hanging apparatus comprising: a support structure extending along a longitudinal axis and having a rear surface; a mounting bracket coupled to the rear surface of the support structure, the mounting bracket having an upper edge and a lower edge and being elongated in a direction transverse to the longitudinal axis of the support structure; a first elongate member comprising a first surface, an opposite second surface, at least one mounting element protruding from the first surface of the first elongate member, and a first bracket protruding from the second surface of the first elongate member for engaging a top edge of a door; and the support structure slidably mounted to the mounting bracket through mating between the at least one mounting element of the first elongate member and the lower edge of the mounting bracket. Further areas of applicability of the present invention will become apparent from the detailed description provided hereinafter. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. Part DETAILED DESCRIPTION: The following description of the preferred embodiment(s) is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. The description of illustrative embodiments according to principles of the present invention is intended to be read in connection with the accompanying drawings, which are to be considered part of the entire written description. In the description of embodiments of the invention disclosed herein, any reference to direction or orientation is merely intended for convenience of description and is not intended in any way to limit the scope of the present invention. Relative terms such as “lower,” “upper,” “horizontal,” “vertical,” “above,” “below,” “up,” “down,” “top” and “bottom” as well as derivatives thereof (e.g., “horizontally,” “downwardly,” “upwardly,” etc.) should be construed to refer to the orientation as then described or as shown in the drawing under discussion. These relative terms are for convenience of description only and do not require that the apparatus be constructed or operated in a particular orientation unless explicitly indicated as such. Terms such as “attached,” “affixed,” “connected,” “coupled,” “interconnected,” and similar refer to a relationship wherein structures are secured or attached to one another either directly or indirectly through intervening structures, as well as both movable or rigid attachments or relationships, unless expressly described otherwise. Moreover, the features and benefits of the invention are illustrated by reference to the exemplified embodiments. Accordingly, the invention expressly should not be limited to such exemplary embodiments illustrating some possible non-limiting combination of features that may exist alone or in other combinations of features; the scope of the invention being defined by the claims appended hereto. Referring to FIGS. 1-2 concurrently, a first embodiment of an over-the-door hanging apparatus 100 is illustrated. The over-the-door hanging apparatus 100 generally comprises a frame 101, a flat article 110 supported within the frame 100, first and second mounting plates 120, 220 secured to a rear surface 103 of the frame 101, and a bracket assembly 150 to which the frame 101 is slidably mounted (as discussed in greater detail below). In the exemplified embodiment of FIGS. 1 and 2, the frame 101 is a perimeter-type frame comprising an outer edge 112 and an inner edge 113. The inner edge 113 forms a closed-geometry thereby defining a central opening 114. A flat article 110, such as a mirror, is positioned and supported within the central opening 114 according to known mounting techniques. Although the invention will be described with reference to the flat article 110 being a mirror, any other substantially flat article (or article with a substantially flat rear surface) can be used in conjunction with the present invention, including artwork, diplomas, or the like. Furthermore, as used herein, the term “frame” is not limited to a traditional perimeter-type frame having a central opening, but includes frames resembling a simple backer-board or plate that takes up the entire (or a portion of) rear surface area of the article to be mounted thereon. Preferably, however, the desired flat article is displayed by frame 101 so as to be visible to a user when the over-the-door hanging apparatus 100 is hung from a door as described below. The over-the-door hanging apparatus 100 comprises a first mounting plate 120 and a second mounting plate 220 that are secured to the rear surface 103 of the frame 101 on opposite lateral sides of a vertical centerline A-A. The first and second mounting plates 120, 220 are secured to the frame 101 via screws 121, 221, respectively. Of course, other fasteners and fastening techniques can be used to secure the first and second mounting plates 120, 220 to the frame, including without limitation bolts, nails, rivets, clamps, ties, slot-and-groove mating connections, snap-fit connections, and/or combinations thereof. The over-the-door hanging apparatus 100 also comprises a bracket assembly 150 to which the frame 101 is detachably mounted. More specifically, the frame 101 is detachably mounted to the bracket assembly through a slidable mating between the first and second mounting plates 120, 220 and the hooks of the bracket assembly 150, which will be described in great detail below. The frame 101 comprises a first channel 130 and a second channel 230 (fully visible in FIG. 5). Only a bottom portion of the first and second channels 130, 230 is visible in FIGS. 1 and 2. In the exemplified embodiment, the over-the-door hanging apparatus 100 comprises a perimeter-style frame 101, two mounting plates 120, 220 and a bracket assembly 150 that includes a first elongate bracket member 151 and a second elongate bracket member 251. In this embodiment, the two mounting plates 120, 220 are attached to the frame 101 on opposite sides of the vertical centerline A-A of the frame 101 while the first elongate member 151 is slidably attached to the first mounting plate 120 and the second elongate member 251 is slidably attached to the second mounting plate 220. Of course, the invention is not so limited and the over-the-door hanging apparatus 100 may comprise only one mounting plate and one elongate bracket member connected to a central region of the frame 101. Alternatively, the over-the-door hanging apparatus 100 may comprise greater than two mounting plates and a corresponding number of elongate members of the bracket assembly to provide for a more secure connection between the bracket assembly 150 and the frame 101. Moreover, while the first and second elongate bracket members 151, 251 are exemplified as separate structures, it is possible for theses members 151, 251 to be formed as a single construct. For purposes of referencing direction and orientation of the various components of the over-the-door hanging apparatus 100, it should be noted that relative terms such as top, bottom, left, right, lateral, proximal, distal, upward, outward, inward, vertical, horizontal, and the like are used to delineate relative positions of the components of the inventive over-the-door hanging apparatus 100 with respect to one another and with respect to the vertical centerline A-A and are not intended to be in any further way limiting of the present invention. Referring now to FIGS. 2, 3a and 3b concurrently, a detailed description of the bracket assembly 150 will be set forth. The structural details of the elongate bracket members 151, 252 will be discussed herein with respect to the first elongate member 151 with the understanding that the same is applicable to the second elongate member 251 in all respects. The first elongate member 151 extends from a distal end 152 to a proximal end 153 and comprises a front surface 193 and an opposite rear surface 194. The first elongate member 151 is preferably an integrally formed structure formed by appropriately bending a flat strip of flexible metal, such as a sheet metal. Of course, other materials and formation techniques can be used, including the molding, milling and/or lathing of plastics, matrix materials, or any other material capable of withstanding the required load-bearing requirements. Moreover, while the first elongate member 151 of the bracket assembly 150 is preferably flexible in nature, it may be constructed so as to be substantially rigid if desired. A generally U-shaped bracket 158 is provided at a proximal end 153 of the first elongate member 151 and extends from the rear surface 194 thereof for sliding over and engaging a top edge of a door. The U-shaped bracket 158 comprises a front portion 154, a top portion 155 and a back portion 156 that terminates with an angled flange 157. The front portion 154 corresponds to a top portion of the elongate member 151 and it encompasses the proximal end 153 of the elongate member 151. The top portion 155 extends outward from the rear surface 194 of the elongate member 151 at the proximal end 153 so as to form an approximately 90 degree angle with the front portion 154 of the U-shaped bracket 158. Although the top portion 155 is described as extending at an approximately 90 degree angle from the front portion 154 of the U-shaped bracket 158, it may extend at other angles if desired. The back portion 156 of the U-shaped bracket 158 extends downwardly from the top portion 155 at an approximately 90 degree angle with the top portion 155, thereby forming the U-shaped bracket 158 of the first elongate member 151 of the bracket assembly 150. The angled flange 157 diverges slightly outward from the back portion 156 at an obtuse angle θ in order to facilitate placement of the U-shaped bracket 158 over a top edge of a door as will be described below with reference to FIG. 8. The U-shaped bracket 158 is preferably made of a flexible material so that it can bend and more easily fit over doors with varying widths. In other words, it is preferable that a user is able to extend the distance between the back portion 156 and the front portion 154 of the U-shaped bracket 158 by applying an outward force on the flange 157. The top portion 155 of the U-shaped bracket 158 is made wide enough to accommodate a conventional door width which the inventive bracket assembly 150 is to be used. The thickness of the material, and hence its flexibility, must be chosen so that the U-shaped bracket 158 is sufficiently rigid to avoid deformation under the load of the flat article 110 and yet is thin enough to fit over the top of the door without creating clearance problems with respect to the cap of the door frame. In use, a user may grip and pull on the flange portion 157 of the U-shaped bracket 158 of the bracket assembly 150 in order to assist with the attachment of the bracket assembly 150 to the top edge of a door as will be described in detail below with reference to FIG. 11. The first elongate member 151 further comprises a top hook 161 and a bottom hook 162 near the distal end 152 of the elongate member 151. The top hook 161 and the bottom hook 162 collectively form a pair of hooks and are often referred to as such throughout this application. In the exemplified embodiment, the top and bottom hooks 161, 162 are integrally formed with the first member 151. More specifically, the top and bottom hooks 161, 162 are preferably formed by punching an appropriate pattern in the first elongate member 151 and subsequently bending the in-plane tab out of plane and into the desired shape. As a result, apertures 163, 164 (i.e. holes) are formed in the elongate member 151 behind the hooks 161, 162. The apertures 163, 164 enable the elongate member 151 to be manufactured with less material and also prevent the elongate member 151 from prematurely deteriorating due to the friction of the mounting plates 120, 220 against the hooks 161, 162. Of course, the apertures 163, 164 need not be included as a part of the elongate member 151 and the hooks 161, 162 can be separate structures that are subsequently welded, fastened, clamped or otherwise connected to the first elongate member 151. The top and bottom hooks 161, 162 each extend outwardly from the front surface 193 of the elongate member 151 and upwardly toward the proximal end 153. The top hook 161 extends from a base 166 at which it connects to the elongate member 151 to a distal end 192 at which it terminates. Similarly, the bottom hook 162 extends from a base 165 at which it connects to the elongate member 151 to a distal end 191 at which it terminates. The top and bottom hooks 161, 162 are preferably in a linear vertical alignment with one another on the front surface 193 of the elongate member 151. The hooks 161, 162 each have a length which is equal to the distance from the bases 165, 166 to the distal ends 191, 192 of the hooks 161, 162, respectively. The base 166 of the top hook 161 is spaced a distance D1 from the base 165 of the bottom hook 162, the importance of which will become apparent from the description below with reference to FIGS. 4a and 4b. The top and bottom hooks 161, 162 are preferably S-shaped tabs. The S-shape of the top and bottom hooks 161, 162 are preferred in order to accomplish an efficient attachment between the bracket assembly 150 and the mounting plates 120, 220 as will be described below. The invention, of course, is not limited by the shape of the hooks and other shapes may be used as would be known to persons skilled in the art. For example, the top and bottom hooks 161, 162 could simply be straight tabs extending outwardly in an angled fashion from the bracket assembly 150 for slidable mating with the edges of the mounting plates as described below. Furthermore, it should be understood that the term hooks is intended to include any tab-type structure that may extend outwardly from the bracket assembly 150 in a manner that affords slidable mating with the edges of the mounting plates 120, 220 and is not intended to be in any other way limiting of the present invention. Both of the top and bottom hooks 161, 162 extend outwardly and upwardly from the front surface 193 of the elongate member 151 in a spaced part manner so that slots 168, 169 are formed between the hooks 161, 162 and the front surface 193 of the elongate member 151. Both of the slots 168, 169 have an open top end 167, 197 that provides access into the slots 168, 169 so that the edges of the mounting plates can be lowered into the slots 168, 169 during mounting of the frame 101 to the bracket assembly 150, which will be described in greater below with reference to FIG. 6. Referring now to FIGS. 4a and 4b, the details of the mounting plates 120, 220 of the present invention will be described. Similarly to the description of the elongate members 151, 251 above, only the first mounting plate 120 will be described in detail with the understanding that the discussion is applicable to the second mounting plate 220. The first mounting plate 120 is preferably a flat plate that can be secured to the frame 101 by any of the techniques described above. The first mounting plate 120 comprises a plurality of screw holes 122 that are sized and configured to receive a screw to facilitate the attachment of the first mounting plate 120 to the frame 101. Although the first mounting plate 120 is illustrated having three screw holes 122, the invention is not so limited and the first mounting plate 120 may have more or less than three screw holes 122 as desired. When attached to the frame 101, a rear surface (not shown) of the first mounting plate 120 is in surface contact with the rear surface 103 of the frame 101 by nature of their opposing flat surfaces. The first mounting plate 120 is preferably a flat plate that is substantially free of contour for the entirety of its major planar surfaces. The first mounting plate 120 has an overall perimeter shape such that its cross-sectional area changes throughout its length. The first mounting plate 120 has a bottom edge 125, a top edge 126 and two vertical sides that collectively form the perimeter of the first mounting plate 120. The first mounting plate 120 also comprises a vertical axis B-B that is substantially transverse to and intersects the bottom and top edges 125, 126 of the first mounting plate 120. A top section 127 of the first mounting plate 120 extends from the top edge 126 of the first mounting plate 120 to a transition point TP1. A middle section 128 of the first mounting plate 120 extends from the transition point TP1 to a transition point TP2. A bottom section 129 of the first mounting plate 120 extends from the transition point TP2 to the bottom end 125 of the first mounting plate 120. The cross-sectional area of the top section 127 of the first mounting plate 120 gradually decreases from a point 141 in the top section 127 to the transition point TP1. The middle section 128 of the first mounting plate 120, which extends from the transition point TP1 to the transition point TP2, has a constant cross-sectional area throughout its length. The cross-sectional area of the bottom section 129 of the first mounting plate 120 gradually increases from the transition point TP2 to a point 142. The cross-sectional area of the first mounting plate 120 is again constant from the point 142 of the bottom section 129 of the first mounting plate 120 to the bottom edge 125 of the first mounting plate 120. The shape of the first mounting plate 120 provides the first mounting plate 120 with a structural rigidity while using a minimized amount of materials in order to reduce the costs in manufacturing. In the illustrated embodiment, the first mounting plate 120 comprises a top aperture 123 and a bottom aperture 124. The top aperture 123 is positioned partially within both of the top and middle sections 127, 128 while the bottom aperture 124 is positioned within the bottom section 129 only. Although the invention is described with a plate having two apertures, the first mounting plate 120 may have only one aperture or more than two apertures as would be understood by a person skilled in the art. Furthermore, the apertures 123, 124 may be positioned on other locations on the first mounting plate 120 as desired. Using more apertures will enable additional adjustability to the hanging height of the article as will be described below. The apertures 123, 124 in the first mounting plate 120 are preferably rectangular in shape, but may take on any other shape as desired. The top aperture 123 is defined by a closed-geometry edge that includes a top edge 145 and a bottom edge 143. Similarly, the bottom aperture 124 is defined by a closed-geometry edge that includes a top edge 146 and a bottom edge 144. The top edge 145 of the top aperture 123 is spaced a distance D2 from the top edge 146 of the bottom aperture 124, measured along the linear axis B-B. Similarly, the top edge 146 of the bottom aperture 124 is spaced a distance D3 from the bottom edge 125, measured along the axis B-B. The first mounting plate 120 is designed so that the distance D2 is substantially equal to the distance D3. Furthermore, both of these distances D2, D3 are also substantially equal to the distance D1 between the hooks 161, 162 (discussed above with respect to FIGS. 3a, 3b). The importance of the edges 145, 146, 125, and the distances D1, D2, D3 will become apparent from the description below with reference to FIG. 5. Referring now to FIG. 5, a portion of the over-the-door hanging apparatus 100 is illustrated in an exploded state. As can be seen, the frame 101 comprises has a first channel 130 formed into the rear surface 103 on one side of the vertical centerline A-A of the frame 101 along the right lateral (another one of the channels is provided on the opposite side of the vertical centerline A-A). In the exemplified embodiment of FIG. 5, the channel 130 is illustrated as a segmented channel 130 comprising a first channel segment 131, a second channel segment 132 and a third channel segment 133. As noted above, FIG. 5 illustrates the channel 130 as comprising a first channel segment 131, a second channel segment 132 and a third channel segment 133. However, more than three channel segments may be used as desired for further adjustability in the hanging height of the over-the-door hanging apparatus 100 as will be described below. Furthermore, the frame 101 may be configured with less than three channel segments and still be used as described below as would be understood by a person skilled in the art. Each of the channel segments 131-133 of the channel 130 is a rectangular shaped depression formed into the frame 101. The channel segments 131-133 of the channel 130 each form a groove or trough within the rear surface 103 of the frame 101 that comprises a floor and, thus, do not extend through the entire thickness of the frame 101. However, in alternative embodiments, one or more of the channel segments 131-133 of the channel 130 may be through-holes in the sense that they could extend all the way through the thickness of the frame 101. Of course, the channel segments 131-133 are contemplated as taking on any other shapes, including without limitation circles, triangles, trapezoids or the like. Furthermore, while the channel 130 is exemplified as a segmented channel, the invention is not so limited and the channel 130 may be a singular continuous annular channel that extends around the entire perimeter of the rear surface 103 of the frame 101 or can be a continuous channel that extends from below the bottom edge 125 of the first mounting plate 120 to above the top edge 145 of the top aperture 123 of the first mounting plate 120. These alternative embodiments are shown in FIGS. 7-9 and will be described in greater detail below. Referring to FIGS. 5 and 6 concurrently, the placement and attachment of the first mounting plate 120 to the rear surface 103 of the frame 101 will be described. In FIGS. 5 and 6, only the first mounting plate 120 is shown for clarity and ease of understanding. However, it is to be understood that the second mounting plate 220 is attached to the rear surface 103 of the frame 101 in the same manner as the first mounting plate 120, except that the second mounting plate 220 is attached to the opposite side of the vertical centerline A-A of the frame 101 (FIG. 2) in cooperation with a second channel. The first mounting plate 120 is secured to the rear surface 103 of the frame 101 so that the vertical axis B-B of the first mounting plate 120 is coextensive with the elongated channel 130, which in the exemplified embodiment is substantially parallel with the vertical centerline A-A. The second mounting plate 220 is secured to the rear surface 103 of the frame 101 on the opposite side of a vertical centerline A-A of the frame 101 in an identical orientation with respect to the second channel 230. More specifically, the first mounting plate 120 is secured to the frame 101 so that: (1) the first channel segment 131 extends from a position below the bottom edge 125 of the first mounting plate 120 to a position above the bottom edge 125 of the first mounting plate 120; (2) the second channel segment 132 extends from a position below the top edge 146 of the bottom aperture 124 of the first mounting plate 120 to a position above the top edge 146 of the bottom aperture 124 of the first mounting plate 120; and (3) the third channel segment 133 extends from a position below the top edge 145 of the top aperture 123 of the first mounting plate 120 to a position above the top edge 145 of the top aperture 124 of the first mounting plate 120. While not required, it may be preferred that the first mounting plate 120 be secured to the frame 101 so that further: (1) the bottom edge 144 of the bottom aperture 124 is aligned with the top edge 146 of the bottom aperture 124 of the first mounting plate 120; and (2) the bottom edge 143 of the top aperture 123 of the first mounting plate 120 is aligned with the top edge 145 of the top aperture 123 of the first mounting plate 120. When the first mounting plate 120 is secured to the frame 101 in the manner described above, the top aperture 123 is aligned with the first channel segment 133 and forms a passageway through the first mounting plate 120 into the third channel segment 133. Similarly, the bottom aperture 124 is aligned with the second channel segment 132 and forms a passageway through the first mounting plate 120 into the second channel segment 132. Moreover, the top edge 145 of the top aperture 123 extends transversely across the third channel segment 133. The top edge 146 of the bottom aperture 124 extends transversely across the second channel segment 132. The bottom edge 125 of the first mounting plate 120 extends transversely across the first channel segment 131. Referring solely now to FIG. 6, the first, second and third channel segments 131-133 preferably extend above the bottom edge 125 of the first mounting plate 120, the top edge 146 of the bottom aperture 124, and the top edge 145 of the top aperture 123, respectively, by a distance that is at least equal to the length of the hooks 161, 162. This configuration provides sufficient space for the hooks 161, 162 to fit within the selected channel segments 131-133 when the frame 101 is slidably mounted to the bracket assembly 150 as will be discussed below. Referring to FIGS. 2, 5 and 6 concurrently, the attachment of the bracket assembly 150 to the first and second mounting plates 120, 220 will be described. The description will be provided with specific reference to the mating between the first mounting plate 120 and the first elongate member 151 of the bracket assembly 150. However, it should be understood that the description is equally applicable to the mating of the second mounting plate 220 with the second elongate member 251. After properly aligning the first mounting plate 120 as described above, the first mounting plate 120 is secured to the rear surface 103 of the frame 101 by extending the screws 121 through the screw holes 122 and threadily engaging the frame. It is preferred that the first and second mounting plates 120, 220 be preassembled (i.e., secured) to the frame 101 during manufacturing. Thus, the user will be able to hang the apparatus 100 to a door without the need for any tools or excessive physical strength. In other words, the user will purchase the product fully assembled with the exception that the bracket assembly 150 will be separate from the first and second mounting plates 120, 220 and frame 101. As such, the user will only need to slide the U-Shaped brackets of the bracket assembly 150 over the top edge of the door and then slide the hooks 161, 162 of the bracket assembly into mating cooperation with either: (1) the top edges 145, 146 of the apertures 123, 124; or (2) the top edge 146 and the bottom edge 125. By nature of having an option between sliding the hooks 161, 162 of the bracket assembly into mating cooperation with either: (1) the top edges 145, 146 of the apertures 123, 124; or (2) the top edge 146 and the bottom edge 125, the inventive over-the-door hanging apparatus 100 has an advantageous built-in hanging height adjustability. In other words, depending upon which of the channel segments 131-133 of the frame 101 the top and bottom hooks 161, 162 are attached to, the hanging height may be altered. A more detailed description of how the inventive over-the-door hanging apparatus 100 may be hung at a lower and/or a higher position will be set forth below. It should be understood, however, that while the description will be set forth below in relation to the first elongate member 151 mating with the first mounting plate 120 and the first channel 130, the same principles apply to the mating between the second elongate member 151, the second mounting plate 220, and the second channel 230. When a lower hanging position is desired, such as is shown in FIG. 6, the first elongate member 151 of the bracket assembly 150 will be attached to the frame 101 by inserting the bottom hook 162 through the bottom aperture 124 in the first mounting plate 120 and the top hook 161 through the top aperture 123 in the first mounting plate 120. Because the first mounting plate 120 is attached to the frame 101 so that the bottom aperture 124 is aligned with the second channel segment 132 and the top aperture 123 is aligned with the third channel segment 133, the bottom hook 162 will be inserted into the second channel segment 132 of the frame 101 while the top hook 161 will be inserted into the third channel segment 133 of the frame 101. Once sufficiently inserted through the apertures 123, 124 and into the second and third channel segments 132, 133 of the frame 101, the frame 101 will be lowered (or the elongate member 151 will be raised) until the top edge 145 of the top aperture 123 of the first mounting plate 120 slides into the slot 168 of the top hook 161 and the top edge 146 of the bottom aperture 124 of the first mounting plate 120 slides into the slot 169 of the bottom hook 162. When fully slid into the slots 168, 169, the base 165 of the bottom hook 162 will contact the top edge 146 of the bottom aperture 124 of the first mounting plate 120 and the base 166 of the top hook 161 will contact the top edge 145 of the top aperture 123 of the first mounting plate 120. As noted above, the second and third channel segments 132, 133 extend upwardly beyond the edges 145, 146 (in the direction of the vertical axis A-A) and beneath the first mounting plate 120. This configuration enables the hooks 161, 162 of the bracket assembly 150 to extend into the frame 101 so that a portion of the first mounting plate 120 is snugly disposed within each of the slots 168, 169. Through this slidable mating, the hooks 161, 162 frictionally engage the portions of the first mounting plate 120 positioned within the slots 168, 169 to prevent the frame 101 from becoming accidentally dislodged from the bracket assembly 150. The frictional engagement is further facilitated by the S-shape and resilient nature of the hooks 161, 162. Although the attachment is described as being a friction fit, the invention is not so limited and the attachment may be described as a press fit, an interference fit or any other fit as would be known to persons skilled in the art. The attachment between the bracket assembly 150 and the frame 101 will be enhanced when the U-shaped bracket 158 of the bracket assembly 150 is attached to a top edge of a door because the weight of the flat article 110 being hung will increase the tight nature of the fit between the hooks 161, 162 and the combined plate/frame 120/101 apparatus. The invention has been described with the bracket assembly 150 attached to the second and third channel segments 133, 132 in the frame 101. Such an attachment is used when the hanging height of the mirror or article is desired to be a lower hanging height. As noted above, the hanging height of the over-the-door hanging apparatus 100 is adjustable. Therefore, the mirror or other flat article 110 may be hung at a higher hanging height in the manner described below and as shown in FIG. 2. When the first mounting plate 120 is secured to the frame 101, the first channel segment 131 in the frame 101 extends beyond the bottom edge 125 of the first mounting plate 120 as illustrated in FIG. 2. Therefore, rather than attaching the bracket assembly 150 through the second and third channel segments 133, 132 of the frame 101, the hooks 161, 162 of the bracket assembly 150 are attached to the second and first channel segments 132, 131 of the frame 101, respectively. Specifically, the bottom hook 162 will be inserted into the first channel segment 131 below the bottom edge 125 of the first mounting plate 120 while the top hook 161 will be inserted into the second channel segment 132 via the bottom aperture 124 of the first mounting. Once sufficiently inserted into the first and second channel segments 131, 132 of the frame 101, the frame 101 will be lowered (or the elongate member 151 will be raised) until the top edge 146 of the bottom aperture 124 of the first mounting plate 120 slides into the slot 168 of the top hook 161 and the bottom edge 146 of the first mounting plate 120 slides into the slot 169 of the bottom hook 162. When fully slid into the slots 168, 169, the base 165 of the bottom hook 162 will contact the top edge 146 of the bottom aperture 124 of the first mounting plate 120 and the base 166 of the top hook 161 will contact the bottom edge 125 of the first mounting plate 120. As noted above, the first and second channel segments 131, 132 extend upwardly beyond the edges 146, 125 (in the direction of the vertical axis A-A) and beneath the first mounting plate 120. This configuration enables the hooks 161, 162 of the bracket assembly 150 to extend into the frame 101 so that a portion of the first mounting plate 120 is snugly disposed within each of the slots 168, 169. Thus, the same frictional/interference fit is formed. With such an attachment, the apparatus 100 may be hung at a higher level on a door than previously described manner. Thus, the present invention provides an easy and efficient way for a user to adjust the hanging height of a mirror or other object without the need for tools or an excessive amount of physical force. The adjustable height mounting is achieved by designing the distances D1, D2, D3 to be substantially equal. Of course, the second elongate member 251 may be attached in the same manner as described above except that the second elongate member 251 is attached to the second mounting plate 220 which is secured onto the frame 101 on the opposite side of the vertical centerline A-A. By using the first and second elongate members 151, 251, the flat article 110 will be more securely hung from the top of the door. Referring to FIGS. 7 and 8 concurrently, an alternative embodiment of a frame 301 to be used with an over-the-door hanging apparatus 300 will be described. The components of the over-the-door hanging apparatus 300 that are the same as the components described above with reference to the over-the-door hanging apparatus 100 will be delineated by the same reference numerals except that the over-the-door hanging apparatus 300 will use the 300- and 400-series of numbers rather than the 100- and 200-series of numbers. Furthermore, only those aspects of the over-the-door hanging apparatus 300 that are different from the over-the-door hanging apparatus 100 described above will be described below in detail. Therefore, all features of the over-the-door hanging apparatus 300 that are not described below should be interpreted as being identical to the corresponding component from the over-the-door hanging apparatus 100 described above. Specifically, rather than having a channel 130 comprising three distinct channel segments 131-133 in the frame 101 that require time and effort in order to properly align the first and second mounting plates 120, 220 as described above, the frame 301 may have a continuous channel 330 along all four sides of the frame 301 so as to form an annular channel about the perimeter of the frame 301. This embodiment is advantageous in that it reduces the costs in manufacturing by reducing the amount of material needed to create the frame 301 and by reducing the time required to attach the first and second mounting plates 320, 420 to the frame 301. In use, the first mounting plate 320 is aligned with the channel 330 so that the channel 330 can be seen through the apertures 323, 324 in the first mounting plate 320. This embodiment nullifies the need to align the apertures 323, 324 of the first mounting plate 320 with the channel 330 in a vertical direction and instead enables the first mounting plate 320 to be attached to the frame 301 in a myriad of positions so long as the channel 330 is visible and accessible through the apertures 323, 324. Such an embodiment provides a significantly greater amount of flexibility to the hanging height of the flat article. After the first mounting plate 320 (and preferably also the second mounting plate 420) is secured to the frame, the hooks 361, 362 of the bracket assembly 350 are inserted through the apertures 323, 324 of the first mounting plate 320 in the same manner as described above. The entire attachment procedure between the bracket assembly 350 and the frame 301 is identical to the attachment procedure described above with reference to the bracket assembly 150 and the frame 101. Essentially, the over-the-door hanging apparatus 300 is identical to the over-the-door hanging apparatus 100 except that instead of having a segmented channel 130 in the frame 101, there is one continuous channel 330 in the frame 301 that forms a rectangular border around the entirety of the frame 301. As can be seen the channel 330 still extends from a position below to a position above each of the edges 345, 346, 325. Referring to FIG. 9, another alternative embodiment of the channel in the frame will be described. This embodiment comprises a continuous channel 530 that is not segmented and that does not form a border around the frame 101. Rather, the channel 530 only extends from a position below the bottom edge 147 of the first mounting plate 120 to a position above the top edge 145 of the top aperture 123 of the first mounting plate 120. In such an embodiment, a second channel (not shown) which is identical to the channel 530 will be located on the opposite lateral side of the frame 101, thereby forming a mirror image. Referring to FIG. 10, an alternative embodiment for a mounting plate will be described. The first and second mounting plates 120, 220 may each comprise a first plate segment 621, 721, a second plate segment 622, 722 and a third plate segment 623, 723. This embodiment will be further described only with reference to the first mounting plate 120. It should be understood that the second mounting plate 220 will have features and components that are identical to the first mounting plate 120. In the embodiment illustrated in FIG. 10, a bottom edge 625 of the third plate segment 623 serves an identical purpose to the bottom edge 125 of the first mounting plate 120 described above. Furthermore, a bottom edge 646 of the second plate segment 622 serves an identical purpose to the top edge 146 of the bottom aperture 124 of the first mounting plate 120. Further still, a bottom edge 645 of the first plate segment 621 serves an identical purpose to the top edge 145 of the top aperture 123 of the first mounting plate 120. It should be understood to a person skilled in the art that the inventive over-the-door hanging apparatus 100 would operate in the same exact manner with the three plate segment 621, 622, 623 embodiment as it would with the mounting plate 120 as described above. In other words, the bracket assembly 150 will be attached to the embodiment illustrated in FIG. 10 in the same manner as was described above. Referring to FIG. 11, the mirror 110 or other article is illustrated hanging from a top edge 171 of a door 170. In the illustrated embodiment, the mirror or other flat article 110 is attached to the bracket assembly 150 which comprises the first elongate member 151 and the second elongate member 251 on opposite lateral sides of the rear surface (not shown) of the flat article 110. The U-shaped brackets 158, 258 of the elongate members 151, 251 of the bracket assembly 150 are attached to the top edge 171 of the door 170 so that the flat article 110 is hung therefrom. When the flat article 110 is a mirror, it is hung so that the reflective front surface 111 is visible and the rear surface (not shown) is in surface contact with the door 170. It should be understood that any of the various types of channels and mounting plates may be used with the inventive over-the-door hanging apparatus in many different combinations. For example, the three plate segment 621, 622, 623 mounting plate may be used with the segmented channels 131, 132, 133 or with the elongated channel 530 or with the border/annular channel 330. Similarly, the first and second mounting plates 120, 220 may also be used with any of
{'bibliographic_information': "{'country': 'US', 'doc-number': '15297291', 'kind': 'B2', 'date': '20161019', 'invention_title': 'Over-the-door hanging apparatus'}", 'source_file': './grant/2017/ipg170418.xml', 'source_data': 'USPTO-Grant'}