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"Transmission of documents via telephone wires is possible in principle, but the apparatus required is so expensive that it will never become a practical proposition."
Dennis Gabor, British physicist
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| Number | Title | Issue Date |
| 7424824 | Liquid sensing apparatus for a liquid container for supplying a liquid to a liquid consuming apparatus, and a liquid container in which the liquid sensing apparatus is built A liquid sensing apparatus includes a liquid sensing chamber 33 having a liquid inlet port that is in communication with an external liquid container in which a liquid is reserved, and a liquid outlet port that is in communication with a liquid consuming appa... | 09/16/2008 |
| 6955083 | Vertical liquid level measuring device A system for actuating an indicator in response to a depth change in a liquid that is confined to a container comprises a housing, a float constrained to vertical movement in response to changes in liquid depth in the container, an actuator connected to the housing ... | 10/18/2005 |
| 5771178 | Fail-safe fluid transfer controller A fail-safe fluid transfer control apparatus has full redundancy in the response to various inputs such as overfill probe signals, ground detection signals, and the like. Independent microprocessor controllers independently evaluate the inputs and each ou... | 06/23/1998 |
| 4813282 | Vehicle fuel level sensor A vehicle fuel level sensor comprising a hollow cylindrical body housing a sliding float, the position of which is determined by the fuel level in the fuel tank. The sensor also comprises a filter surrounding as portion of the side wall of the cylindrical... | 03/21/1989 |
| 3937084 | Liquid level indicator A liquid level indicator for a liquid container, such as the crankcase oil reservoir of an internal combustion engine, comprises a source of fluid at a predetermined pressure and a fluid conduit system connected to the fluid source. A gage responsive to f... | 02/10/1976 |
