Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 4375821 | Control value A valve adapted to control liquid pressure by sliding within a valve housing a bottomed tubular valve closure member having a porous peripheral wall. The pores are subjected to reverse flush by moving the valve closure member to a closed position and also... | 03/08/1983 |
| 4275860 | Full span shipboard fueling system for aircraft A shipboard system that provides safe storage and complete quality control of aviation fuels from acceptance of the fuel at shipside to delivery of clean, dry fuel at a shipborne aircraft includes a storage tank disposed in a closed chamber defined by a c... | 06/30/1981 |
| 4220173 | Time delay fluid valve A fluid operated valve device which effects a time delay in the shifting of a main valve spool. Pressurized pilot fluid is metered at a controlled rate through an air filter and a spiral groove which is restricted in size to delay the pressure build up of... | 09/02/1980 |
| 4047540 | Multi-path valve structure having extended life and backwashing capability Multiple path means for a fluid flow control device is shown in connection with a typical spool type servo valve. The multiple path means consists of a stack of washer-like elements or disks which cooperate to define a number of finely divided flow paths ... | 09/13/1977 |
| 4045004 | Chemical mixing and pumping apparatus Apparatus for commingling liquid chemicals includes a mixing tank having a drain valve and a liquid container impaling head for piercing a container impressed thereon so that the container's liquid chemical contents will flow into the tank. A pump is oper... | 08/30/1977 |
| 3985300 | Self-purging injection valve This invention discloses a self-purging injection valve comprising at least one supply port, at least one purging waste port, an injection port and an injection port barrel, the injection port barrel projecting from the injection port through the valve in... | 10/12/1976 |
| 3938541 | Shaft seal for a check valve A shaft seal for a check valve having a shaft rotatably disposed within a valve housing. The shaft seal is disposed within a recess defined within the interior of the valve housing between a bushing member and the shaft. Disposition of the seal within the... | 02/17/1976 |
