U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?

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Class 361/199 - Including electric discharge device

Subclass of Class 361 - Electricity: electrical systems and devices
Definition: Subject matter wherein the control circuit includes an electric
No. of patents: 0