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| Number | Title | Issue Date |
| 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 |
| 7338181 | Eye protecting table lamp having an air purification function An air purification apparatus and an illuminating apparatus which provide an eye protecting table lamp that emits gentle light and has an air purification function. The eye protecting table lamp comprises a lamp body unit, a lamp base unit, a focus lamp unit and an ... | 03/04/2008 |
| 7292045 | Detection and suppression of electrical arcing Method and apparatus for detecting or suppressing electrical arcing or other abnormal change in the electrical impedance of a load connected to a power source. Preferably the load is a plasma chamber used for manufacturing electronic components such as semiconductor... | 11/06/2007 |
| 7242173 | Combined test instrument probe and voltage detector A voltage detector is combined with a test instrument probe to provide an indication of the presence of a.c. voltage when the test instrument probe approaches or comes in contact with a source of a.c. voltage. ... | 07/10/2007 |
| 7232990 | Peak detection calibration for gamma camera using non-uniform pinhole aperture grid mask Point source responses of pinhole apertures in a non-uniform grid mask used to spatially calibrate a gamma camera can be modeled as a two-dimensional Gaussian function with a set of seven parameters. The Gaussian parameters can be measured using a surface-fitting al... | 06/19/2007 |
| 7109712 | Method and apparatus for minimizing gradient coil and rf coil coupling A method and apparatus are provided which reduce coupling between a Z-axis gradient coil and an rf coil in magnetic resonance imaging systems and an rf shield disposed between the Z-axis gradient coil and the remaining gradient coils. The reduction in coupling is ac... | 09/19/2006 |
| 6998832 | High-voltage indicating apparatus and method A digital voltage indicator includes a probe having a first electrode including a hollow portion and a probe tip projecting from the hollow portion, a second electrode extending into the hollow portion and spaced therefrom, and dielectric material disposed between t... | 02/14/2006 |
| 6040530 | Versatile printed circuit board for testing processing reliability A printed circuit board can be used as a test card. The printed circuit board has a first image and a second image. The first image includes a first array pattern for attaching a package, a first power plane, and a first ground plane. The second image inc... | 03/21/2000 |
| 6032524 | Method and apparatus for detecting p-static interference source The detection of components that cause p-static interference with communications and navigation equipment is essential to the maintenance of an aircraft. A p-static source locator uses two leads to supply a voltage between components of the aircraft. If t... | 03/07/2000 |
| 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 |
| 5739419 | Apparatus for monitoring the vacuum of a vacuum switch An apparatus for monitoring the vacuum of a vacuum switch having at least one vacuum switch tube with a switch chamber and switch contacts is provided. The apparatus has a remotely interrogatable pressure measurement sensor in the form of a piezocrystal o... | 04/14/1998 |
| 5671158 | Apparatus and method for effecting wireless discourse between computer and technician in testing motor vehicle emission control systems An apparatus and method for use at a motor vehicle emission test station, providing wireless communication between a computer and a technician. The computer includes a sound card and voice recognition software, and is housed in a console, having test equi... | 09/23/1997 |
| 5399973 | Method and apparatus for detecting a reduction in the degree of vacuum of a vacuum valve while in operation An improved vacuum valve including an insulating container and an arc shield held in the insulating container, wherein a protrusion is formed on either the outer cylindrical surface of the arc shield or on the inner surface of the container. A detecting e... | 03/21/1995 |
| 5049843 | Strip-line for propagating microwave energy A device for propagating microwave energy to a plasma discharge tube from an antenna coupled to a microwave generator includes a hollow rectangular conduit and a strip-line resonator or strip-line conductor disposed therein. The discharge tube is mounted ... | 09/17/1991 |
| 4906935 | Method and equipment for vacuum monitoring in vacuum switching tubes To check the presence of operating vacuum in vacuum switches, high voltage can be applied between the contacts at a given contact spacing and the dielectric strength can be tested. According to the invention, the procedure for vacuum monitoring is that a ... | 03/06/1990 |
| 4797619 | Method and apparatus for measuring spatial profiles of energy beams An apparatus and method for measuring the spatial characteristics of color CRTs includes the scanning of an image of a white vertical line with a knife edge aperture and integrating the intensity values at each position of the knife edge. The centroids of... | 01/10/1989 |
| 4638215 | Circuit assembly for temperature-dependent cathode current tracking in traveling-wave tubes A circuit assembly for temperature-dependent cathode current tracking in traveling-wave tubes having control electrodes and cathodes with a predetermined cathode current, in combination with a power supply, includes a temperature-dependent network thermal... | 01/20/1987 |
| 4588952 | Arc discharge abnormality detecting system The present invention provides an arc discharge abnormality detecting system which in generating source plasma by the arc discharge using a plurality of filaments as the cathode in an ion source, detects an arc discharge current flowing in each of the fil... | 05/13/1986 |
| 4534741 | Method for assessing the dielectric state of a high voltage vacuum device using radiation generated by field emission current The radiation generated by electrons from field emission current striking the anode of a high voltage vacuum device is used as an analog for the emission current in a method for assessing the dielectric state of the device. The emission current is determi... | 08/13/1985 |
| 4514682 | Secondary electron spectrometer for measuring voltages on a sample utilizing an electron probe An improved secondary electron spectrometer for measuring voltages occurring on a specimen, such as an integrated circuit chip, utilizing an electron probe has a grating structure for measuring the energy distribution of the secondary electrons independen... | 04/30/1985 |
| 4471265 | Apparatus for counteracting the cathode current increase occurring during warming-up in a travelling-wave tube in response to variation in the grid-cathode distance Apparatus for compensating the injurious increase of the cathode current occurring during the initial operation period of a travelling-wave tube when, during successive warming-up, the grid first approaches the cathode and then assumes the nominal distanc... | 09/11/1984 |
| 4453128 | Digital display testing circuit A circuit for testing a segment of a digital display comprising a segment of a digital display having a cathode filament for conducting electrical current and for emitting electrons, and detecting means connected to the cathode filament for detecting elec... | 06/05/1984 |
| 4306188 | Photomultiplier tube having a photocurrent collector An electron discharge device includes an envelope with a primary electrode and substances for forming a photocathode therein. A photocurrent collector is provided which is electrically insulated from the photocathode and the primary electrode. The photocu... | 12/15/1981 |
| 4283747 | Methods of making a gas tube surge protector A gas tube surge protector (11) includes a housing (12) and spaced electrodes (14 and 16) which form a gastight envelope (27). A width of a gap (31) between the electrodes is precisely established by urging at last one of the electrodes (14) toward the ot... | 08/11/1981 |
