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Date: Fri, 16 Feb 2001 18:32:27 -0800 (PST)
From: Dan Hollis <goemon@anime.net>
To: David Relson <relson@osagesoftware.com>
cc: <linux-kernel@vger.kernel.org>
Subject: re:  XOR  [ was: Linux stifles innovation... ]
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On Fri, 16 Feb 2001, David Relson wrote:
> At 08:52 PM 2/16/01, you wrote:
>  > 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.
> 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!

So you approve of 4,197,590 and think it was an innovative and non obvious
invention in 1980?

-Dan

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