Titelpage of the first German patent from 1877 about preparing of the color <a href="https://en.wikipedia.org/wiki/en:Ultramarine" class="extiw" title="w:en:Ultramarine">ultramarine</a> (version with removed spots of original scan)
Uploaded scan: Wahnfried; retouched by <a href="//commons.wikimedia.org/wiki/User:Jaybear" title="User:Jaybear">Jaybear</a>;
1877-07-02
<a href="https://en.wikipedia.org/wiki/en:Deutsches_Patent-_und_Markenamt" class="extiw" title="w:en:Deutsches Patent- und Markenamt">Deutsches Patent- und Markenamt</a> (DPMA); <a href="//commons.wikimedia.org/wiki/File:Patentschrift_no1.jpg" title="File:Patentschrift no1.jpg">File:Patentschrift no1.jpg</a><a rel="nofollow" class="external text" href="http://worldwide.espacenet.com/publicationDetails/originalDocument?CC=DE&amp;NR=1C&amp;KC=C&amp;FT=D&amp;ND=&amp;DB=&amp;locale=de_EP">Patent DE 1</a>