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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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Number of patents: 1
Last date: November 05, 1991

Number	Title	Issue Date
5063224	R-cefuroxime axetil R-Cefuroxime axetil which is substantially free of the S-isomer is readily absorbed from the stomach and gastro-intestinal track of animals, and is therefore ideally suited to oral therapy of bacterial infections....	11/05/1991