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| Number | Title | Issue Date |
| 7639017 | Method and arrangement for monitoring the mercury condensation in an arc tube Methods for preventing blackening of a gas filled arc tube of a mercury vapour discharge lamp. Lamp voltage and slope, as well as lamp current and slope are analyzed to determine the state of mercury saturation of the gas in the arc tube. A first control signal is s... | 12/29/2009 |
| 7368916 | Apparatus and methods for making capacitive measurements of cathode fall in fluorescent lamps Apparatus and methods for measuring cathode fall in fluorescent lamps are disclosed. Together with measurements of cathode temperature, such measurements of cathode fall may inform a determination of cathode heater voltage as a function of discharge current (i.e., a... | 05/06/2008 |
| 7084656 | Probe for semiconductor devices An interconnection contact structure assembly including an electronic component having a surface and a conductive contact carried by the electronic component and accessible at the surface. The contact structure includes an internal flexible elongate member having fi... | 08/01/2006 |
| 6949752 | Electron beam apparatus and high-voltage discharge prevention method Disclosed is an electron beam apparatus and method which can retain the state that minimizes the amount of water content contained at a gap between a high-voltage cable and a high-voltage introduction insulator to thereby prevent creation of high-voltage discharge a... | 09/27/2005 |
| 6359057 | Modeling dough and method of making the same A moldable composition comprising a polar polymeric resin, present in an amount ranging from 0.5-15% by weight, a filler, present in an amount up to 50% by weight, a thickening agent, present in an amount ranging from 0.1-3% by weight, a humectant, presen... | 03/19/2002 |
| 5760544 | Magnetron microwave generator with filament-life diagnostic circuit The microwave generator with use of a magnetron comprises a microwave detector for detecting microwave output from the magnetron and a filament life diagnostic circuit for judging the life of filament of the magnetron by decreasing an input power to a fil... | 06/02/1998 |
| 5144246 | Vacuum tube characterization apparatus An apparatus measures the operational parameters of a vacuum tube that has an anode, a cathode, a grid and a filament. A source of a bias potential for the anode is included along with a generator that produces a series of pulse at each of a plurality of ... | 09/01/1992 |
| 5012194 | Method testing electron discharge tubes A method of testing an electron discharge device incorporating a cathode electrode heated by bombardment of electrons emitted by a heater electrode so that selected parameters of such device may be determined without requiring that such device be operatio... | 04/30/1991 |
| 4296356 | Ionization vacuum gauge circuit In a circuit for an ionization vacuum gauge having a thermionic filament, a control circuit receptive of a control current for controlling the filament and a switch for applying the control current to the control circuit, a circuit is provided for indicat... | 10/20/1981 |
| 3938034 | Gas tube tester The embodiment of the invention disclosed herein is directed to a gas tube tester which provides a pair of terminals for connection to the external electrodes of a cold cathode gas discharge tube. The tester includes one circuit for applying a progressive... | 02/10/1976 |
