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From: aeb@briar.Philips.Com (Anne Barschall)
Newsgroups: comp.misc
Subject: Re: AT&T owns X-windows ??  (was Re: Software Pat
Message-ID: <118831@philabs.Philips.Com>
Date: 13 Mar 91 21:17:27 GMT
References: <1991Mar1.184945.6946@mtxinu.COM> <996@caslon.cs.arizona.edu> <685@newave.UUCP> <6497@auspex.auspex.com> <693@newave.UUCP>
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Reply-To: aeb@briar.philips.com.UUCP (Anne Barschall)
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In article <693@newave.UUCP> john@newave.mn.org (John A. Weeks III) writes:
>I did, but I was slightly mistaken.  It is patent #4,197,590, owned
>by Cadtrak.  It was upheld twice in court even though the technique
>was used by others for many years before Cadtrak applied for the patent.

You can bet that no one was able to prove that the technique was used before
Cadtrak applied for a patent, otherwise the patent would NOT have stood up in
court.