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Patent Information

Delphion
Searchable database of granted U.S. patents. It includes images and text for patents issued from 1971 on as well as images for patents issued between 1790 and 1971. Tracking, status information, and the first page of the application are available for free.
Added by JC

freepatentsonline
FreePatentsOnline search engine is one of the most powerful, fastest and easiest patent search engines on the web.
Added by JC

PATENTSCOPE
Sponsored by the World Intellectual Property Organization (WIPO), a specialized agency of the United Nations, this site is dedicated to developing a balanced and accessible international intellectual property (IP) system.
Added by JC

SUMOBRAIN
Provides intellectual property searching for attorneys, corporate researchers and inventors. All our services are completely free
Added by JC

U.S. Patent and Trademark Office
Includes general information, plus specifics on patents, trademarks, and copyright. Inventors will find the how-to's and support section helpful.
Added by JC

USPTO Web Patent Databases
US Patent Full Text Databases. One provides the full text content of US patents issued from January 1, 1976 to the most recent weekly issue date. The other features published applications since March 15, 2001.
Added by JC