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 |
| 5930459 | Immersion heating element with highly thermally conductive polymeric coating Electrical resistance heating elements are provided which are useful in heating fluid mediums, such as air and water. The heating elements include an element body having a supporting surface and a resistance wire wound onto the supporting surface which is... | 07/27/1999 |
| 5703998 | Hot water tank assembly Hot water heaters are provided which contain improved temperature control devices and multiple resistance wire heating elements. The temperature control devices selectively deactivate at least one of the resistance wires to conserve electricity and preser... | 12/30/1997 |
| 5586214 | Immersion heating element with electric resistance heating material and polymeric layer disposed thereon Polymeric heating elements and water heaters containing these elements are provided by this invention which utilize polymeric materials in contact with electric resistance heating materials and in contact with fluid to be heated. These polymeric materials... | 12/17/1996 |
