Did You Know...
...that Thomas Edison's patent application on his phonograph was approved by the Patent Office in just seven weeks? In contrast, it took Gordon Gould, the inventor of the laser, 30 years to obtain his patent -- finally awarded in 1988!
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| Number | Title | Issue Date |
| 4165546 | Portable cuspidor A portable cuspidor supplied with rinse water and vacuum drainage through ganged flexible hoses has a hollow, enclosed cuspidor cup or bowl provided with a cushioned side wall opening against which facial areas surrounding the mouth of the patient or user... | 08/28/1979 |
| 3964112 | Dental cuspidor with fluid recirculation system A water recirculation system is described wherein the discharge of one or more dental cuspidors is rendered reuseable and continuously used in the operation of a water sealed vacuum pump in a dental vacuum discharge system.... | 06/22/1976 |
