Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!snorkelwacker.mit.edu!bloom-beacon!dont-send-mail-to-path-lines
From: mouse@lightning.mcrcim.mcgill.EDU
Newsgroups: comp.windows.x
Subject: Re:  AT&T Claims patent on part of MIT's X11 server.
Message-ID: <9102231551.AA01386@lightning.McRCIM.McGill.EDU>
Date: 23 Feb 91 15:51:15 GMT
Sender: daemon@athena.mit.edu (Mr Background)
Organization: The Internet
Lines: 20

> Consequently, we bring to your attention an AT&T patent #4,555,775
> invented by Robert C. Pike and issued on November 26, 1985.  The
> "backing store" functionality available in the X Windows System is an
> implementation of this patented invention,

Or at least so AT&T is reported to be claiming.

Has anyone looked up patent #4555775?  It seems to me it would be most
helpful to post a copy of it.

Also, have similar letters arrived in any other countries?  Any non-US
Consortium members care to speak up?

(Really.  Trying to patent backing-store.  Well, that finally puts paid
to any thoughts I might have had about buying *anything* from AT&T.)

					der Mouse

			old: mcgill-vision!mouse
			new: mouse@larry.mcrcim.mcgill.edu