Archived posting to the Leica Users Group, 1997/10/22

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Subject: Leica Lens Patents
From: "Frank Filippone" <red735i@worldnet.att.net>
Date: Wed, 22 Oct 1997 06:42:26 -0700

The subject concerns the use of LTM on newly made lenses like the Ricoh 28
MM lens.

Marc Small offered:
"The patent on the LTM expired in 1952.  The patent on the M bayonet mount
expired in 1973."

Is it possble that there is an International patent that is blocking the
independent manufacture of M mount lenses by companies like Ricoh?

Marc and any lawyer types out there, what is the situation with foreign
patent time scales?

Frank