U.S. patents available from 1976 to present.
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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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Inventor: Felix F. Laurus

Address: Ottawa, CA
No. of patents: 1
Last patent issue date: 04/05/1977

Number	Title	Issue Date
4015396	Joist A steel joist having an upper chord, a web, and a lower chord; the upper chord consisting of an S shaped cross section elongated member having in one form a lower reverse flange at the base of the S, the flange being connected to the web so that the cente...	04/05/1977