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 |
| 5950190 | Dynamic, self-modifying graphical user interface for relational database applications A dynamic database interface for relational and object-oriented databases includes a dynamic, self-modifying graphical user interface defining a plurality of graphical windows for searching and editing the contents of the relational database, as well as m... | 09/07/1999 |
| 5901928 | Active turbulence control technique for drag reduction A method of disrupting a turbulent region of a boundary layer within a fluid flow passing over a surface to decrease momentum transfer, and thus friction drag, between the turbulent flow and the surface. Bending waves are generated on the surface to impos... | 05/11/1999 |