Drawing of the Incandescent Light Bulb by Thomas Edison
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On January 27, 1880, The Patent Office granted Thomas Edison’s patent for the “electric-lamp.” His patent was an improvement on electric lamps, not the invention of them, but because of Edison’s design changes and the materials he used—such as a carbon filament—his patent allowed for an electric lamp that was reliable, safe, and practical. Text adapted from “Teaching with Documents : OurDocuments.gov” in the November/December 2002 National Council for the Social Studies (NCSS) publication Social Education.
This primary source comes from the Records of the Patent and Trademark Office.
National Archives Identifier: 302053Full Citation: Drawing of the Incandescent Light Bulb by Thomas Edison; 1/27/1880; Records of the Patent and Trademark Office, Record Group 241. [Online Version, https://www.docsteach.org/documents/document/drawing-of-the-incandescent-light-bulb-by-thomas-edison, July 25, 2016]
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