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From: hes@ecsvax.UUCP (Henry Schaffer)
Newsgroups: net.graphics
Subject: Re: exclusive-ORed cursors (Patent)
Message-ID: <544@ecsvax.UUCP>
Date: Mon, 7-Oct-85 18:33:52 EDT
Article-I.D.: ecsvax.544
Posted: Mon Oct  7 18:33:52 1985
Date-Received: Wed, 9-Oct-85 03:38:59 EDT
References: <588@stc-b.stc.UUCP> <5988@utzoo.UUCP> <914@turtlevax.UUCP>, <745@terak.UUCP>, <6018@utzoo.UUCP> <6026@utzoo.UUCP>
Organization: NC State Univ.
Lines: 18

> > The use of exclusive-OR to draw and erase cursors, rubber band lines,
> > etc. is covered by patent number 4,197,590...
> 
> (Forgot this in my previous response) It would also be nice to know the
> date of the patent.
> -- 
> 				Henry Spencer @ U of Toronto Zoology
> 				{allegra,ihnp4,linus,decvax}!utzoo!henry
Date:  Apr. 8, 1980
Inventors: Josef S. Sukonick (Cupertino, CA), Greg J. Tilden (San Jose, CA)
Assignee:  NuGraphics, Inc.  (Cupertino, CA)
Title:  Method for Dynamically Viewing Image Elements Stored in a Random
Access Memory Array
  This patent is 26 pages, with 21 Drawing Figures, and has 16 claims.  It
is for a computer-graphics display system, and includes various operations.
  The NCSU library is a US patent repository.  They told me that there are 
58 in the USA, with most states having one.
--henry schaffer