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U.S. patents available from 1976 to present.
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...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?

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Number of patents: 1
Last date: July 28, 2009

Number	Title	Issue Date
7565704	Sports helmet A safe protective sports helmet is provided which includes a hat body, the hat body is provided therein with a circle of a head encircling element, and is provided rotatably thereon with a rotatable adjusting button. The head encircling elements and the rotatable ad...	07/28/2009