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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 | Title | Issue Date |
| 4310577 | Liquid crystal film laminate A liquid crystal film laminate embodies an indicator component and a supportive and protective component removable from the indicator component to provide maximum flexibility and minimum mass in the resulting indicating article. The indicator component in... | 01/12/1982 |
| 4175543 | Venipuncture method A method of effecting venipuncture in the human body includes the steps of cooling the skin over a venous area of the body by applying a cold pack thereto and providing on the cooled skin in heat exchange relation thereto a layer of an enantiotropic chole... | 11/27/1979 |
| 4161557 | Polyvinyl butyral-liquid crystal film-forming composition and film An alkyd-type polymeric plasticizing resin or castor oil is incorporated in a mixture of a polyvinyl butyral film-forming polymer and a cholesteric liquid crystalline phase material, to provide a composition which when in the form of a film exhibits accen... | 07/17/1979 |
| 4015591 | Cholesteric liquid crystalline phase material-dye composition and venapuncture method employing the composition A composition of matter having thermal color responsive characteristics and adapted for exhibiting improved color contrast includes an enantiotropic cholesteric liquid crystalline phase material, and at least two oil-soluble dyes dissolved in the material... | 04/05/1977 |
