The ADOX brand for photographic purposes has been used by three different companies since its original conception over one hundred fifty years ago. ADOX was originally a brand name used by the German company, Fotowerke Dr. C. Schleussner GmbH of Frankfurt am Main, the world's first photographic materials manufacturer. In 1962 the Schleussner family sold its photographic holdings to DuPont, an American company. DuPont used the brand for its subsidiary, Sterling Diagnostic Imaging for X-ray films. In 1999, Sterling was bought by the German company Agfa. Agfa did not use the brand and allowed its registration to lapse in 2003. Fotoimpex of Berlin, Germany, a company founded in 1992 to import photographic films and papers from former eastern Europe immediately registered the brand and today ADOX is a brand of black and white films, photographic papers and photochemistry produced by ADOX Fotowerke GmbH based in Bad Saarow near Berlin. History Fotowerke Dr. C. Schleussner GmbH (1860 - 1962) ADOX was originally a brand name used by the German company, Fotowerke Dr. C. Schleussner GmbH of Frankfurt am Main, the world's first photographic materials manufacturer. The company's founder, Dr. Carl Schleussner, did pioneering work on the wet-collodion process during the early years of photography, and formed his manufacturing company in 1860. Working with the physicist Wilhelm Röntgen, discoverer of X-rays, Dr. Schleussner invented the first X-ray plate. The Schleussner firm began marketing cameras under the ADOX brand name in the first third of the 20th century and, recognizing the growing importance of the brand, renamed itself "Adox Fotowerke Dr. C. Schleussner GmbH." In 1952 they introduced a line of very sharp black and white 35 mm films under the ADOX brand. DuPont & Agfa (1962 - 2003) In 1962, the Schleussner family sold its photographic holdings to DuPont, an American company. DuPont became owners of the trademark, and registered it in the United States. In the 1970s, Dupont licensed the Adox film technology, but not the trademark, and sold the coating plant with 'dip and dunk' machinery of their film to Fotokemika, Samobor, Croatia (at the time Yugoslavia) in 1972 who continued to produce the traditional black and white films according to the 1950s ADOX formulas under the Efke brand. (See List of discontinued photographic films). The Efke black & white KB (135) and R (120) films in 3 speeds (ISO 25, 50 and 100) were noted for their wide-latitude, smooth