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 D07/553.3 - Symmetrical

Subclass of Class D07 - Equipment for preparing or serving food or drink not elsewhere specified
Definition: Design that shows identical halves if divided through
No. of patents: 5
Last issue date: 05/25/2010