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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 |
| 3977494 | Adjustable support and housing for a doll and the like The invention relates to a housing which supports a platform for mounting a historic figure, the platform being slidable on tracks mounted in the housing and being held in adjusted positions by friction means cooperable with the track. The housing also en... | 08/31/1976 |
| 3964571 | Acoustic system An acoustic system for disposition proximate to an acoustical boundary comprising at least one acoustic transducer for directing acoustic energy away from the boundary and an acoustic reflector surface extending, without substantial acoustic discontinuity... | 06/22/1976 |
| 3938618 | Speaker grille screen and mounting structure A speaker system for a small radio device includes a cover plate having slots therein and a rigid grille screen having channels which extend into the slots. The cover plate and grille screen are generally planar and parallel to each other, and the channel... | 02/17/1976 |
| 3938617 | Speaker enclosure An acoustic speaker enclosure of sufficiently thin design that it may be suspended from a wall and then concealed by a framed picture being hung thereover. Forwardly directed sound from the speaker radiates transversely through 360° through a first passa... | 02/17/1976 |
| 3931867 | Wide range speaker system In the speaker system disclosed herein, the magnet supporting basket of a downwardly-facing, acoustic-suspension woofer supports a bell-shaped diffuser which circumferentially disperses midrange acoustic components radiated from the back side of the speak... | 01/13/1976 |
