U.S. Patent and Trademark Information U. S. Patent and Trademark Office features online publications, downloadable forms in Adobe Acrobat format, and other information. According to the site, access patents issued before 1976 by patent number or current U. S. classification number. The page images are in .tiff format which requires an additional software plugin for viewing and printing. Software and instructions are available from the site. Use the Manual of U. S. Patent Classification to determine the current US classification number.
Patents issued before that date have the letter X before a number.
Trademark Database with the full bibliographic text of pending and registered trademarks. Read the disclaimer for dates of coverage. These notices and rule changes are currently in effect unless otherwise noted. It contains patent family documents and legal status information from 65 and 22 patent offices, respectively. The Intellectual Property Network brings together both of these pieces of information into a single searchable database and makes available 30 million patent family documents and 45 million legal status actions.