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 152/104 - With independent annulus guide and drive

Subclass of Class 152 - Resilient tires and wheels
Definition: In a spring wheel having a spring encircling rigid annulus
No. of patents: 0