January 27th, 1880:
On this late January day, the US Patent Office granted Thomas Alva Edison a patent for his “electric-lamp.” The patent number is 223,898.
Edison’s patent was an improvement on existing electric lamps, not a new invention.
However, Edison’s design changes and the materials he used, including the inclusion of a carbon filament, his patent allowed for an electric lamp that was reliable, safe, and practical for use around the country.
Featured image courtesy of Jennifer Baldwin.
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