Patent Full-Text and Full-Page Image Databases (USPTO) – Search for full-page patents since 1790 (patents for 1790 to 1975 are searchable only by patent number and current U.S. classification) and full-text since 1976.
Trademark Electronic Search System (TESS) (USPTO) – TESS contains more than 3 million pending, registered and dead federal trademarks. Various search options are available.
U.S. Patent and Trademark Office – Home page of the Patent and Trademark Office. Describes the application process, legal issues, and databases for searching patents and trademarks.
Commercial and Educational Sites