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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 |
| 7121295 | Internal blow out preventer ball and seat An internal blow out preventer is provided that includes a ball valve including a tubular assembly having a central passageway with upper and lower seats mounted therein. A ball is rotatably received between the upper and lower seats and includes an external surface... | 10/17/2006 |
| 6698444 | Freeing of seized valves In order to free a seized valve, an inspection port is formed in a wall of the valve body and the areas where the valve is seized are determined. One or more injection ports are formed in the valve body adjacent to the seized portions of the valve, pressu... | 03/02/2004 |
| 4733803 | Particulate dispensing apparatus A dispensing apparatus adapted to be mounted over a can line for dispensing metered amounts of particulate material into cans in a high speed canning operation. The dispenser utilizes a metering unit which includes a reciprocating slide bar having a pair ... | 03/29/1988 |
| 4664140 | Reversing valve There is disclosed a reversing valve for use with a regenerative coke oven, in which the valve cock is lubricated, having four spaced longitudinally extending lubrication grooves that communicate with lubrication means when the valve is in one of its desi... | 05/12/1987 |
| 4506696 | Gas tight plug valve A rotatable valve member for use in controlling fluid flow in a conduit, such as a conduit used for the transmission of liquids and gas in oil servicing operations, is disclosed. The plug valve has a rotatable cylindrical plug member received within a bod... | 03/26/1985 |
| 4372338 | High pressure valve assembly A high pressure rotary plug valve having at least one groove in the housing to provide a flushing/lubricating flow of innocuous fluid between the housing and rotary plug thus preventing fine solids build-up and decrease wear.... | 02/08/1983 |
