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 238/102 - Top and bottom

Subclass of Class 238 - Railways: surface track
Definition: Top and bottom cover-plates for cement ties.
No. of patents: 0