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 238/14.9 - Protected bond

Subclass of Class 238 - Railways: surface track
Definition: Devices for protecting the rail bond or its terminal portions
No. of patents: 0