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Patent Related Web Sites

United States Patent and Trademark Office

• USPTO Home page
• Advanced Patent Search
• Withdrawn patents
• Classes in the U.S. Patent Classification System – Dates Established

Various Countries

• Canada 1869-1919: http://www.collectionscanada.gc.ca/databases/patents/001038-100.01-e.php
• Canada 1920-present: http://brevets-patents.ic.gc.ca/opic-cipo/cpd/eng/search/advanced.html
• European Patents: http://worldwide.espacenet.com/advancedSearch?locale=en_ep
• Google's US Patent Advanced Search
• Google's Hosting of Raw USPTO data
• Press release about the above link.
• French patents from 1791 to 1871 Contact archives@inpi.fr

Scanned Books

• Canada 1824-1872: http://www.archive.org/stream/listofcanadianpa00cana#page/n5/mode/2up
• Google Books
  • Canadian Patents 1824-1849 (some drawings)
  • Subject-matter index of patents for inventions granted in Italy from 1848 to May 1, 1882
  • US Patent Gazette April 5 to June 28, 1887 vol 39
  • US Patent Gazette May 1912 vol 178
  • US Patent Gazette June 1912 vol 179
  • US Patent Gazette January 1913 vol 186
  • US Patent Gazette March 1913 vol 188
  • US Patent Gazette June 1913 vol 191
  • US Patent Gazette July 1913 vol 192
  • US Patent Gazette November 1918 vol 256
  • US Patent Gazette July 1920 vol 276
  • US Patent Gazette August 1921 vol 289
  • French machinery patents 1844-1852
• Hathi Trust / University of Michigan
  • US Patent Gazette Collection
  • US Patent Index Collection
  • US Trademark Index Collection
  • Subject-matter index of patents for inventions issued by the United States Patent office from 1790 to 1873
  • Patent Commissioner Decisions Collection
  • Canadian Patent Gazette Collection
  • Alphabetical index of patentees of inventions. Great Britain Patent Office 1854
  • French Patents 1828-1880

Number Guides

• U.S. Patent Number Guilde
• U.S. Trademark Number Guide
• Canadian Patent Number Guide
• U.S. Patent Classes by Title

Pages on Patent Searching

• Midwest Tool Collectors Patent Page
• Six Easy Steps to Highly Effective Patent Searching

Miscellaneous

• PTRCA (Patent and Trademark Resource Center Association) Historical Patent and Trademark Databases and also their handout page of useful guides etc.
• Patent models index : guide to the collections of the National Museum of American History, Smithsonian Institution (pdf file)
• D'Elia Antique Tool Museum. Museum of patented planes. Here are the patents from our database.
• Good basic summary of patent, copyright and trademark law.
• Steward Russ Allen's site to provide Patents, Trademarks, Prints and Labels data.