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| Number | Title | Issue Date |
| 7383733 | Method and apparatus for the sonic detection of high pressure conditions in a vacuum switching device A method and apparatus for detecting a high pressure condition within an interrupter includes introducing high intensity ultrasonic sound into the outer wall of a vacuum interrupter through a sonic wave guide, then listening for the reflected and retransmitted respo... | 06/10/2008 |
| 7313964 | Method and apparatus for the detection of high pressure conditions in a vacuum-type electrical device A method for detecting a high pressure condition within a high voltage vacuum device includes detecting the position of a movable structure such as a bellows. The position at high pressures can be detected optically by the interruption of a light beam reflected by a... | 01/01/2008 |
| 7302854 | Method and apparatus for the detection of high pressure conditions in a vacuum-type electrical device A method for detecting a high pressure condition within a high voltage vacuum device includes detecting the position of a movable structure such as a bellows or flexible diaphragm. The position at high pressures can be detected optically by the interruption or refle... | 12/04/2007 |
| 7225676 | Method and apparatus for the detection of high pressure conditions in a vacuum switching device A method for detecting a high pressure condition within an interrupter includes measuring the intensity of light emitted from an arc created by contacts within the interrupter, comparing the measured intensity with a predetermined value, and providing an indication ... | 06/05/2007 |
| 6268995 | Double-bellows vacuum variable capacitor A vacuum variable capacitor includes a vacuum bellows for allowing a pressure differential between two volumes inside the capacitor, wherein one of the volumes may be a vacuum volume. The vacuum variable capacitor further includes a conductive bellows dis... | 07/31/2001 |
| 6236556 | Variable capacitor tuning apparatus A tuning head for use with a variable capacitor includes a coupler having a gap, a first optical fiber operatively coupled to the coupler, and a second optical fiber operatively coupled to the coupler. The first and second optical fibers are optically cou... | 05/22/2001 |
