🚀 go-pugleaf

In article <HT.91Feb28104153@scott.cogsci.ed.ac.uk> ht@cogsci.ed.ac.uk (Henry Thompson) writes:
>As regards the comments about Xerox PARC, I can certainly confirm that
>the Interlisp-D window system used the backing-store approach (the
>memory for the screen itself has the bits you see, each window has the
>bits it is currently covering up) as early as 1978.  Richard Burton
>was responsible in the first instance.  It is possible, even probably
>given the antecedants of that work, that Smalltalk used this approach
>as early as 1976.  Peter Deutsch, for one, should know -- Peter, are
>you listening?

The patent cites in its "Other Publications" section, three papers on
Smalltalk, all from Byte Volume 6, Number 8.  Pike probably would not
have cited Smalltalk if he was aware his patent contained only
material already in Smalltalk.

>
>So, what is the date on the Backing Store patent?

It was filed Oct 7, 1982 and granted Nov 26, 1985.
-- 

Jeffrey Kegler, Independent UNIX Consultant, Algorists, Inc.
jeffrey@algor2.ALGORISTS.COM or uunet!algor2!jeffrey
137 E Fremont AVE #122, Sunnyvale CA 94087