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Article #376Re: When does PKP's RSA patent expire?
From: Bruce Schneier
Date: Wed, 04 Nov 1992 06:30
Date: Wed, 04 Nov 1992 06:30
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In article <Bx1o2L.AMz@access.digex.com> jthomas@access.digex.com (Joe Thomas) writes: > In all the posts I've read about PKP's patent claims over RSA public >key encryption, I have never seen anyone mention when the patent is due >to expire. I was under the impression that U.S. patent protection is only >good for 17 years (I believe that's true for drugs, anyway). RSA papers >go back to the mid 70s. Is RSA going to be in the public domain soon? > I've seen posts to this group quoting from PKP's patent. How about if The RSA patent, #4,405,829, was awarded on 9/20/83. It expires on 9/20/00. Diffie-Hellman, patent #4,200,770 was awarded on 3/29/80. Merkle-Hellman knapsacks, patent #4,218,582, was awarded on 8/19/80. Finally, Pohig-Hellman, parent #4,424,414, was awarded on 3/3/84. Bruce
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Newsgroups: sci.crypt Path: arc1-ca.pugleaf.net!sparky!uunet!cis.ohio-state.edu!pacific.mps.ohio-state.edu!linac!uwm.edu!ux1.cso.uiuc.edu!uchinews!machine!chinet!schneier From: schneier@chinet.chi.il.us (Bruce Schneier) Subject: Re: When does PKP's RSA patent expire? Message-ID: <Bx6I2K.D6K@chinet.chi.il.us> Organization: Chinet - Public Access UNIX References: <Bx1o2L.AMz@access.digex.com> Date: Wed, 4 Nov 1992 06:30:19 GMT Lines: 15