U.S. Patent and Trademark OfficeCheck patent rules, guidelines for submitting patents, and the U.S. Patent Bibliographic Database (a free searchable database of U.S. patents issued from 1/1/76 to the present; all U.S. patents issued from 1976 to the most recent are full text), and the AIDS Patent Database (a free database of the full text and images of AIDS-related patents issued by the U.S., Japanese and European patent offices).