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From: oz@yunexus.yorku.ca (Ozan Yigit)
Newsgroups: comp.compression
Subject: Re: arithmetic coding patents
Message-ID: <22205@yunexus.YorkU.CA>
Date: 2 Apr 91 05:19:56 GMT
References: <91084.212246BMS101@psuvm.psu.edu> <39851@netnews.upenn.edu> <22151@yunexus.YorkU.CA> <9711:Mar2702:25:5391@kramden.acf.nyu.edu> <22153@yunexus.YorkU.CA> <1991Apr2.025746.13749@riacs.edu>
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In article <1991Apr2.025746.13749@riacs.edu> jaw@riacs.edu
(James A. Woods) lists five patents related to arithmetic
coding:

> [see the ref for the list]

Thank you for the list James. It is always nicer to have some substance
[at least numbers and titles] instead of hearsay yap about these issues. 

>three of the five have glen langdon as an inventor (and assignee ibm corp.)

BCW mentions earlier papers by Rissanen and Langdon, but there is no
mention of these patents. Mark R. Nelson's modeller from Dr. Dobb's uses
Witten/Neal/Cleary code from 1987 CACM, which is included in The Book, pp
133. I think it would be a useful public service to find out which one [if
any] of the listed patents cover this code. [any comments from ucalgary?]

oz
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