Drawing of the Incandescent Light Bulb by Thomas Edison
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The incandescent light bulb
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.
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