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 400/383 - TYPE-BAR-ACTION MECHANISM OR TYPE-FACE ON TYPE-BAR OR TYPE-FACE INKER

Subclass of Class 400 - Typewriting machines
Definition: Subject matter wherein significance is attributed to (a)
No. of patents: 0