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 |
| 7114413 | Portable band saw sharpener The portable band saw sharpener includes a frame for receiving a saw blade that is to be sharpened. A hand-operated motor is pivotally mounted to the frame for driving a grinding wheel, which engages the teeth of the saw blade. A hand-operated structure releasably h... | 10/03/2006 |
| 5461942 | Knife sharpener A knife sharpener is disclosed having an elongated handle and a blade sharpening unit mounted to a platform at a distal end of the handle for rotation between first and second secured positions for selective orientation of a blade draw direction to accomm... | 10/31/1995 |
| 5152105 | Device for sharpening rotary blades A device for sharpening rotary blades driven about a fixed axis of rotation, as widely used in cigarette manufacturing machines, including a pair of mutually coaxial grinding wheels distanced one from the other, angled in relation to the plane occupied by... | 10/06/1992 |
| 4915709 | Knife sharpener A knife sharpener is disposed adjacent a second electrical appliance of a design family. In an inoperative position, the knife sharpener includes design features mimicking the remainder of the design family. When moved to an operative position, the knife ... | 04/10/1990 |
| 4285253 | Mechanical steel for sharpening blades A fine smooth finish can be obtained on blades without grinding by drawing them against a rotating hardened disk with a smooth peripheral edge. One or a pair of hardened disks having smooth, rounded peripheral edges being disposed adjacent to and partiall... | 08/25/1981 |
| 4090418 | Device for reforming and grinding the blade of a knife to be sharpened A device for reforming and grinding the blade of a knife to be sharpened comprising a supporting rod, a grinding plate having a plurality of concentric triangular projections at the both sides thereof, and guide disks arranged at the both sides of said gr... | 05/23/1978 |
| 4069619 | Resurfacing device for screwdrivers and like tools A resurfacing device for screwdrivers and like tools has two sets of rotary grinding members provided with grinding portions arranged along two intersecting planes at right angles to one another. One of the sets of rotary grinding members is mounted to ro... | 01/24/1978 |
