I just saw the article repeated below in gnu.announce:
<begin included article>
Article 71 of gnu.announce:
Date: 22 Feb 91 03:00:42 GMT
Organization: Project GNU, Free Software Foundation,
675 Mass. Ave., Cambridge, MA 02139, USA +1 (617) 876-3296
[ I wonder what prior art existed, and if it invalidates
Subject: AT&T Claims patent on part of MIT's X11 server.
Date: 20 Feb 91 14:38:26 GMT
I thought that this would be of general interest, to say the least..
The following letter has been sent by AT&T to all (to my knowledge)
MIT X Consortium members, though its claims potentially affect *all*
users of The X Window System, version 11 / revision 3 and above.
To quote the letter directly (all misreferences to "X Windows"
intentionally left in):
< Dated February 7, 1991 >
Dear <unfortunate X user>:
AT&T is aware that your company/institution is an active
participant in the further development of the X Windows
System. We assume that your company/institution is, or may
well be, commercially marketing or internally developing
products(s) which are based on an X Windows System
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, therefore, your company/institution needs a license
from AT&T for the use of this patent.
We will be pleased to discuss licensing arrangements with
the appropriate organization in your company/institution. To
expedite these arrangements, your response should be directed
Ms. O. T. Franz at:
10 Independence Boulevard
Warren, New Jersey 07059-6799
We look forward to resolving this matter in the near
Very truly yours,
Manager, Intellectual Property
So. What more can I say? You are, of course, free to direct your
responses to those listed above.. :-)
One also wonders about other window systems using "backing store"
and the degree to which this patent will be enforced.
PCS Computer Systeme GmbH, Munich, West Germany
<end included article>
Seems like this `back store' patent would also cover some aspects
of intuition. Jordan even wonders about other window systems that
use `back store'. Anyone care to commment?
Loren J. Rittle
``NewTek stated that the Toaster *would not* be made to directly support the
Mac, at this point Sculley stormed out of the booth...'' -A scene at the
recent MacExpo. Gee, you wouldn't think that an Apple Exec would be so