[rollei_list] Rolleiflex Planar 3.5/75 6 elements patent
- From: CarlosMFreaza <cmfreaza@xxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Mon, 5 Oct 2009 21:39:41 -0300
I found the US Patent for the 3.5/75 6 elements "Planar" as used in
the Rolleiflex from about 1960, it looks like a Xenotar design clearly
and the diagram is identical regarding the diagram Todd sent me and
regarding that one in Prochnow, the only minimal difference is the
very slight separation between the fourth and fifth element in the
patent that are cemented in the other diagrams. This lens was patented
in Germany in February 1955 for Carl Zeiss and in February 1956 in the
States for Carl Zeiss too.
Look for the Patent number: 2831397 at Google patents.-
Carlos
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