Delphion Intellectual Property Network.
To search, view and analyze patent collections worldwide.

IP Newsflash.
A non-profit website, maintained by Dr. Rolf Claessen, focusing on up-to-date news about intellectual property issues.

Patent Law Links.
Includes links to case law, search engines, worldwide patent office sites, related forms and much more.

Patent Law Materials.
From Cornell Law School, this site contains links to legal documents dealing with patent law.

U.S. Patent and Trademark Office.
Homepage of the U.S. Patent and Trademark Office. Go directly to the U.S. Patent Database search page. Includes both the US Patent Bibliographic Database (a freely searchable database of front page information from US patents issued from 1/1/76 to 6/2/98), and the AIDS Patent Database (a freely searchable database of the full text and images of AIDS related patents issued by the US, Japanese and European patent offices).