|CONGRESSIONAL SERIAL SET|
|Exhibit for the University of Michigan Graduate Library, December 2005|
Eli Whitney patented the cotton gin on March 14, 1794 to separate cotton from
its seeds. In the above letter he requests that his patent be extended beyond 13
years. Application for extension of cotton gin patent, American State Papers 38, Miscellaneous 319, 1811-1812.
Thomas Edison patented the light bulb on January 27, 1880. His original patent drawings appear in the Official Patent Gazette (Art, Architecture and Engineering Library T223 .A. The Annual Report of the Patent Office, Document 2024 (47th Congress, 1st Session, House Executive Document 62, p. 74-75) lists two pages of Edison patents in 1881.
Light Bulb (right)