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 |
| 5205535 | Expanding gate valve assembly An expanding gate valve assembly which includes a gate, a stem for actuating the gate, a segment mounted on one side of the gate, or in an alternate, bidirectional embodiment, two segments with one segment movably mounted on each opposite side of the gate... | 04/27/1993 |
| 4314688 | Gate valve An improved gate valve for high fluid pressure applications has a housing with aligned inlet and outlet passages and a well intercepting those passages. A piston-type gate is slidably positioned in the well and movable by conventional means between an ope... | 02/09/1982 |
| 4294427 | Mono-seat gate valve A single valve element disc and seat gate valve has an in-line flow passage therethrough. The valve seat plane is inclined approximately 5° from the valve stem. First and second cam surfaces are positioned outside the flow passage, and are inclined appro... | 10/13/1981 |
| 4165858 | Gate valve structure A gate valve in which a threaded movable rod supports a cam that serves as a mounting for first and second floating valve plates that are disposed back to back, which valve plates when the cam is in a first position may be moved adjacent to first and seco... | 08/28/1979 |
