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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