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

William F. Semple, a dentist, was awarded the first US Patent on chewing gum in 1869. His recipe contained powdered chalk.

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Class 400/399.1 - By key-lever rolling on fulcrum

Subclass of Class 400 - Typewriting machines
Definition: Subject matter wherein the lever or link that pivots with
No. of patents: 0