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From: brian@worldcontrol.com
Date: Sat, 17 Feb 2001 10:12:38 -0800
To: David Relson <relson@osagesoftware.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: XOR  [ was: Linux stifles innovation... ]
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In-Reply-To: <4.3.2.7.2.20010216211931.00c6d360@mail.osagesoftware.com>; from relson@osagesoftware.com on Fri, Feb 16, 2001 at 09:20:34PM -0500
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>  > On Fri, 16 Feb 2001, Michael H. Warfield wrote:
>  > > > You know XOR is patented (yes, the logical bit operation XOR).
>  > > 	But wasn't that Xerox that had that?

>  > US Patent #4,197,590 held by NuGraphics, Inc.

On Fri, Feb 16, 2001 at 09:20:34PM -0500, David Relson wrote:
> The patent was for using the technique of using XOR for dragging/moving 
> parts of a graphics image without erasing other parts.  Also, since the 
> patent was granted in 1980, the inventors have had their 17 years of patent 
> protection, and we're all free to use the technique - legally!

In 1984 I received a demand letter for $10,000 from the above
referenced company as a unlimited license for use of a that
patent and another patent.

At the time I ran a company that made graphics cards for IBM PCs.

-- 
Brian Litzinger <brian@worldcontrol.com>

    Copyright (c) 2000 By Brian Litzinger, All Rights Reserved
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