162:, most of which were for electric products. The pull-chain electrical light socket was patented in 1896, and his most famous invention, the U.S. electrical power plug, in 1904. It allowed the adoption in the U.S. of convenient, portable electrical devices, which Great Britain had enjoyed since the early 1880s. In 1916, Hubbell was also granted a patent for a three-bladed power plug, including a
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regulators and electrical accessory manufacturers adopted as the standard for that country in the 1930s. It was also adopted in
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In 1888, at the age of 31, Hubbell quit his job as a manager of a manufacturing company and founded
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Between 1896 and 1909 he was granted 45 patents on a wide variety of electrical products.
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