David Kieltyka said:
The Zeiss lens designs weren't stolen per se. They were turned over to or confiscated by the Allies as part of war reparations. From there the designs made their way to Japan as you state. The lawsuit you refer to wasn't against any Japanese company but rather E. German Zeiss. W. German Zeiss claimed it was the true inheritor of the Zeiss name. After W. German Zeiss prevailed in the western courts E. German Zeiss could no longer use the Zeiss name on products exported outside the Soviet Bloc. Thus you'll find later made-for-export lenses branded "CZJ" or "Aus Jena" rather than "Carl Zeiss Jena."
-Dave-
"To the victor belong the spoils."
The following may be off topic for this thread, but I want to clear the record.
David, I was absolutely NOT referring to the lawsuit in the German courts between Zeiss East & West. Carl Zeiss, USA sued Yashica in US courts in the 1950s for patent infringement & won.
The designs "made their way" to Japan? What does this mean? Both Canon & Nikon simply took (stole) the Leica shutter, for example, for their own use. Nikon adopted (stole) the Zeiss Ikon Contax shutter & rangefinder, and Canon did the same for the Leica thread-mount design. Both companies simply took (stole) patented Zeiss lens designs and produced them as their own! The Japanese did this with full knowledge of the Allied Control Commission, which turned a deaf ear to protests from the German companies.
These patent rights had NOT been seized as "war booty" by the Allies, i.e. the Allies seized the intellectual property rights of all enemy companies on the outbreak of the war, but what was seized were only the internal rights. Therefore, the US owned patent rights to Zeiss lenses WITHIN THE US but not in Japan, where the Japanese recognized all German property rights properly registered in that nation and did so in every case EXCEPT for those of the optical & mechanical rights of the German camera companies!
This information is reported by Marc James Small of the Zeiss Historica Society. You can read more about this history in his book: "The Zeiss Compendium" (also under the title: "The Zeiss Ikon Compendium"). He has also written "Non-Leitz Leica Thread-Mount Lenses: A 39mm Diversity," which I have not read but which believe also covers this issue.