Did You Know...
...that one person who claimed to be the inventor of the television is Russian emigre Vladimir Zworykin? In 1929 David Sarnoff, founder of RCA, asked Zworykin what it would take to develop TV for commercial use. He said: a year and a half and $100,000. In reality, it took 20 years and $50 million! Before his death in 1982 at the age of 92, Zworykin said of his invention: "The technique is wonderful. It is beyond my expectations. But the programs! I would never let my children even come close to this thing."
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| Number | Title | Issue Date |
| 6089865 | Tongue cleaning device A device for applying cleaning and/or irrigating liquid directly to the base of the tongue includes a plurality of rigid mechanical fingers which gently part the taste buds when they are moved across the surface of the tongue. The fingers have openings in... | 07/18/2000 |
| 5730084 | Litter box with abrasive surface A litter box for domestic cats or other domestic mammals has interior surfaces which are abrasive and that dull the claws of a cat when it uses the litter box. Abrasive material may be incorporated into the surfaces of the box, can be sprayed or rolled on... | 03/24/1998 |
| 5666907 | Abrasive sheet material for litter box An abrasive sheet material for attachment to the inside surfaces of a litter box includes a substrate of thin, flexible plastic material, such as polyethylene terephthalate, an abrasive material, such as aluminum oxide, bonded by a resin to one surface of... | 09/16/1997 |
| 5564365 | Litter box with abrasive surface A litter box for domestic cats or other domestic mammals has interior surfaces which are abrasive and that dull the claws of a cat when it uses the litter box. Abrasive material may be incorporated into the surfaces of the box, can be sprayed or rolled on... | 10/15/1996 |
