- About.com: Inventors
- Extensive annotated list of invention-related links, includes lists like Chinese Inventions, Famous Inventors, Black Inventors, and Women Inventors
- From Air Brakes to Zinc Furnaces: Pittsburgh and Allegheny City Patentees 1790 - 1879
- Database of patents created by the Carnegie Library of Pittsburgh
- Alabama Inventors Database
- Database of patents created by the Birmingham Public Library
- U.S. Alien Property Custodian Documents Database
- Database of bibliographic data for WWII patent applications that were seized by the Alien Property Custodian in 1942 and published by the Patent Office in the spring of 1943
- Cincinnati Inventors Database
- Database of patents issued to Cincinnati and Hamilton County, Ohio Inventors from 1813 through 1873.
- Confederate Patent Office
- List of Patents issued by the Confederate Patent Office, 1861-1864
- Historical Idaho Patents Database
- Database of patents created by the University of Idaho Library
- Index to Early Louisiana Patents, 1810-1890
- Database of patents created by Miami University Libraries
- Inventors Museum
- Directory of inventors and inventions in categories like Colonial Inventors, Medical Inventions, and War Tech
- Iowa Inventions Database
- Database of patents created by the Iowa State Library
- Nevada Inventors Database
- Database of patents created by the University of Nevada, Reno Libraries
- Oklahoma Inventors Database, 1880 - 1907
- Database of patents created by Oklahoma State University
- South Carolina Inventors, 1793 - 1893
- Database of patents created by Clemson University Libraries
- Women Inventors Index, 1790 - 1895
- Database created by the Miami University Libraries
- Wyoming Inventors Database
- Databases of patents created by the Wyoming State Library
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