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| Number | Title | Issue Date |
| 7317185 | Tamper resistant radon detector Embodiments of the present invention provide for a tamper resistant radon detector monitoring system. Other embodiments may be described and claimed. ... | 01/08/2008 |
| 6365902 | Radiation detector, an apparatus for use in radiography and a method for detecting ionizing radiation A detector for detection of ionizing radiation, an apparatus for use in planar beam radiography, comprising such a detector, and a method for detecting ionizing radiation. The detector includes a chamber filled with an ionizable medium, at least one first... | 04/02/2002 |
| 6320261 | High aspect ratio metallization structures for shallow junction devices, and methods of forming the same A contact interface having a substantially annular silicide ring along sides of a depression formed in an active surface of the semiconductor substrate, wherein the depression is formed by an etching process to form a contact opening through a dielectric ... | 11/20/2001 |
| 5855850 | Micromachined photoionization detector A photoionization detector includes a brittle substrate having a void micromachined therein with a void inlet and a void outlet. First and second electrodes are disposed in the void. An ultraviolet transparent member covers at least a portion of the void ... | 01/05/1999 |
| 5591979 | Device and method for securing an electret in a radon gas detector A device and method for locating an electret in an electret-type radon gas detector, so it is wrinkle free, uses a sloped pedestal over which the electret sheet is placed. A ring with a beveled interior surface and a minor diameter smaller than the top of... | 01/07/1997 |
| 5053623 | Photometric analyzer for differential total reduced sulfur measurement by comparison with sample gas A photometric analyzer for measuring differential total reduced sulfur in a sample gas stream is provided. It includes a supply for a sulfur bearing gas sample, an oven having an inlet connected to the supply for converting TRS to SO2 and an ou... | 10/01/1991 |
| 4567368 | Bipolar pulsed electron capture detectors In operating an ECD in constant current mode, two pulses are implemented either to the same electrode or to separate electrodes, thereby dispersing the space charge sheath near the collector electrode and thus enhancing electron extraction at high frequen... | 01/28/1986 |
| 4388411 | Apparatus and method for detecting fluid The invention relates to apparatus for detecting a constituent gas in a gas flow. Means is provided for removing the constituent gas from a sample flow and directing this sample flow together with a reference flow containing the constituent gas through an... | 06/14/1983 |
| 4166379 | Apparatus for the detection of volatile organic substances An apparatus for detecting the presence of volatile, organic substances in gaseous mixtures comprises a filament on which the substances are absorbed when the filament is cold and released when hot, an electron capture device to detect the emitted substan... | 09/04/1979 |
| 4129782 | Curved location-sensitive proportional counter tube A curved location- or positionally-sensitive proportional counter tube having a trough-shaped cathode in a counting chamber. A curved resiliently elastic wire forming the anode extends longitudinally through the curved counting chamber in conformance with... | 12/12/1978 |
| 3934139 | Apparatus for measuring calorific power of hydrocarbon compounds An apparatus for continuously measuring with safety and high accuracy the calorific power of a sample containing hydrocarbon compounds and sulfur, such as crude oil and petroleum products. The apparatus supplies two energy levels of radioactive rays to be... | 01/20/1976 |
