The Requirement of Early U.S. Patents, the Reason the Working Model Rule Was Phased Out, the Reason Breech Loading Pistols Have Metal Bottoms, Modern Day Silk vs. 19th Century Silk, and the Mythology of Garden Gnomes

Between 1790 and 1880, all US patents required a working model of the idea being patented. This requirement was phased out by the US Congress in 1870, but the US Patent Office continued to stipulate it as a requirement until 1880. The reason for getting rid of this rule was that creating working prototypes was an expensive process and it was difficult to find a trades person who could create the parts needed. It was eventually agreed that this laborious process held up the release of inventions ...

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