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 414/644 - Valved

Subclass of Class 414 - Material or article handling
Definition: Tilting carriers in the form of a bucket skip box or similar
No. of patents: 0