The first U.S. patent was signed by President George Washington

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On Jul. 31, 1790, Samuel Hopkins was issued the first patent under the new U.S. patent statute signed into law by President George Washington on April 10, 1790.

The patent, for a process of making potash, an ingredient used in fertilizer was signed by President Washington. The original document is in the collections of the Chicago Historical Society.

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Source: U.S. Patent and Trademark Office
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