In the United States, a patent reverts to public domain if it is not manufactured and sold within a specified period.

Question

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In the United States, the status of a patent is not dependent on the manufacturing or sale of the patented invention. A patent gives its owner the right to exclude others from making, using, selling, and importing the invention for a limited period, typically 20 years from the filing date, regardless of whether the patented invention is commercially exploited.

In the United States, a Patent Reverts to Public Domain