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Contains more than 1,400,000 patent documents, images and bibliographic descriptions back to 1920 and text of abstracts and claims back to 1978.

Bibliographic data and text of all claims of all patents issued by the United States Patent & Trademark Office from 1971 to present. Requires free registration.

Directory of links related to information on intellectual property, patents, inventions, and trademarks, organized under simple subject headings.

Comprehensive site for all aspects of patent work. Links include case law, U.S. Patent Office, and more. Patent forms can be read and printed with Adobe Acrobat.

Searchable collections of patents and trademarks.