• ESP site
• ESP news
• Donate

en.swpat.org is a wiki.   You can edit it.   It may contain statements End Software Patents does not endorse.

May/June 2013: Help needed documenting events of May 2013

Sitemap • Countries • Why abolish software patents? • Studies • Case law • Patent office case law • Lawsuits

LZW algorithm patent

From en.swpat.org

Jump to: navigation, search

The LZW algorithm patent, owned and enforced by Unisys, is now expired.

From an archive.org copy of Unisys's LZW page:

Unisys U.S. LZW Patent No. 4,558,302 expired on June 20, 2003, the counterpart patents in the United Kingdom, France, Germany and Italy expired on June 18, 2004, the Japanese counterpart patents expired on June 20, 2004 and the counterpart Canadian patent expired on July 7, 2004.[1]

[edit] Related pages on en.swpat.org

[edit] External links

[edit] References

  1. ↑ http://web.archive.org/web/20080113182757/http://www.unisys.com/about__unisys/lzw/


This wiki is part of the End Software Patents (ESP) campaign (donate). For more information, see:
>> EndSoftwarePatents.org - main site <<
>> News: news.swpat.org <<

This wiki is publicly-editable. (See: en.swpat.org:About) It's a pool of information, not a statement of ESP's views or policies, so no permission is required. Add your knowledge! (See: Help:How to make a good contribution)

Retrieved from "http://en.swpat.org/wiki/LZW_algorithm_patent"
Personal tools