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| Number | Title | Issue Date |
| 7402800 | Method and device for the continuous determination of damage to systems used for the post-treatment of heat engine exhaust gases The invention relates to a method for the continuous determination of the damage to at least one system (7) used for the post-treatment of exhaust gases from an internal combustion engine (2), caused by the lubricating oil, the fuel and/or at least one... | 07/22/2008 |
| 7268347 | Ion detecting apparatus and methods Ion injection in a drift tube apparatus for mobility spectrometry was accomplished without conventional ion shutters such as the Bradbury-Nielson or similar designs common to such drift tubes. Instead ions were passed between the ion source and drift region by using... | 09/11/2007 |
| 7196631 | Method of utilizing existing fire alarm systems and existing smoke detectors to detect aerolized radioactive material A method of utilizing existing fire panel infrastructure to fight terrorism. The fire alarm systems ionization type smoke detectors, in addition to detecting the presence of smoke, would also detect the presence of airborne radioactive particles by effecting only a ... | 03/27/2007 |
| 7026948 | Alarm with removable detection circuitry cartridge Provided is an alarm for detecting heat, radiation and/or pollutants. The alarm includes housing means and also includes detection means for detecting the heat, radiation and/or pollutants. The detection means, in turn, includes detection circuitry and a power sourc... | 04/11/2006 |
| 7015820 | Apparatus for monitoring a smoke detector The proper function of a smoke detector of an enclosed space, such as a toilet or freight space or crew quarters in an aircraft, is monitored by at least two air pressure sensors which are so positioned that these air pressure sensors can measure an air pressure dif... | 03/21/2006 |
| 6953936 | Ionization type smoke sensing chamber A modular smoke detector has a sensing electrode carried by an insulator module. The insulator module also carries an ionization source and a field effect transistor. The insulator module lockingly engages a printed circuit board. A conical smoke deflector and exter... | 10/11/2005 |
| 6951062 | Method and apparatus for restricting foreign objects from entering a device A method and apparatus includes a filter positioned with a sample flow path such that it restricts or prevents the passage of foreign materials, liquids or debris into a device such that, if not filtered, the elements harm the operational ability of the device. ... | 10/04/2005 |
| 6933496 | Ion mobility sensor An ion mobility sensor which can detect both ion and molecules simultaneously. Thus, one can measure the relative arrival times between various ions and molecules. Different ions have different mobility in air, and the ion sensor enables measurement of ion mobility,... | 08/23/2005 |
| 6717153 | Apparatus and methods for monitoring emissions Ions produced by radioactive gases present in air impact on the sensitivity of contamination measuring instruments which detect ions generated by radioactive materials present on an item. Methods and apparatus address this issue by conducting a measurement of ions g... | 04/06/2004 |
| 6292105 | Thermal ionization detector An ionization chamber that detects changes in temperature of electrical insulation with a corresponding change in voltage. This voltage change can be relayed through an operational amplifier and a comparator to a device receiving the signal, thus triggeri... | 09/18/2001 |
| 6153884 | Radioisotope proximity sensor A radioisotope proximity sensor is provided for detecting proximity or distance to a nearby object containing a small radiation source complementary to the sensor. The output of the sensor is amplified or compared to determine the distance or proximity. T... | 11/28/2000 |
| 6057774 | Smoke alarm with anti-dust screen Smoke alarms that incorporate dust repelling screens exhibit improved performance with fewer false alarms. Effective screens include conductive strands combined with non-conductive elements.... | 05/02/2000 |
| 5920072 | Ionization detector An ionization detector having an upper ionization chamber, a lower ionization chamber, and a radioactive source located in the upper ionization chamber but shielded from the lower ionization chamber by a barrier. A substantially constant fluid stream of d... | 07/06/1999 |
| 5879947 | Apparatus and method for detecting DMAH using particle sensing detector A method for detecting dimethylaluminumhydride (DMAH) comprises sensing the aluminum oxide particles produced by the reaction of the DMAH with air (or with a small amount of oxygen). This is accomplished using a particle-sensing device, such as those comm... | 03/09/1999 |
| 5856784 | Low profile ionization chamber A very low profile ionization chamber provides increased operating current by using alpha particle emitting isotopes having low emission energies as an ionization source. The chamber includes a cylindrically shaped housing having height generally equal to... | 01/05/1999 |
| 5804828 | Method and apparatus for optimizing the sensitivity and linearity of an electron capture detector Electron capture detector for use with an effluent stream from a gas chromatograph includes an ionization cell and a sample inlet system connected to the ionization cell for providing an effluent fluid having a sample concentration therein. In the preferr... | 09/08/1998 |
| 5633501 | Combination photoelectric and ionization smoke detector An ionization chamber for use in a smoke detector includes first and second outer electrodes and a non-reflective center electrode. The non-reflective center electrode can be formed as a metal electrode having a non-reflective coating or as a non-reflecti... | 05/27/1997 |
| 5485144 | Compensated ionization sensor A compensated ionization-type sensor includes spaced apart active and reference electrodes. A center electrode is disposed between the active reference electrodes. A compensating electrode is disposed adjacent to the center electrode and, capacitively cou... | 01/16/1996 |
| 5399864 | Ionization type smoke detector An ionization type smoke detector includes a detector body, a printed circuit board on the upper surface of the detector body, an electrode mount on the upper surface of the printed circuit board, an inner electrode securing the electrode mount onto the p... | 03/21/1995 |
| 5347139 | Dual energy tracer quantitative analysis Using storage phosphor recording media, two exposures are made of a sample containing two target substances tagged with different radiative emitters, for example 32-P and 35-S. The first exposure, image 1, is of the sample directly on the phosphor screen.... | 09/13/1994 |
| 5317159 | Method of using an electron capture type detector An electron capture type detector for gas chromatography has an ionization vessel containing therein line sources for a radioactive isotope serving as a negative electrode, a collector electrode, a purge gas route, a discharge gas route, and an end of a c... | 05/31/1994 |
| 5243330 | Fire detector system and method A fire detector system including ionization smoke detectors (7) is provided with improved false-alarm protection. The system includes an ionization chamber (1) with a radioactive source (10), connected in series with a resistor (2) between power supply li... | 09/07/1993 |
| 5212470 | Supervised fire alarm system A fire alarm system having increased immunity to false alarms comprises control and indicating means (6) and a plurality of ionization smoke detectors (7) connected through signal lines (8, 9, 14) with the control and indicating means (6), each ionization... | 05/18/1993 |
| 5160916 | Ionization type smoke sensor An ionization-type smoke sensor having a 2-chamber 1-radiation source structure including an inner electrode having a radiation source, an intermediate electrode having an opening through which radiation from the radiation source passes, an outer electrod... | 11/03/1992 |
| 4868546 | Radon detector A portable electronic instrument for detecting radon gas is provided by this invention. The presence of radon gas may be reliably and quantitatively measured with simple and inexpensive immediately operable in-situ detection means. Two detectors comparati... | 09/19/1989 |
| 4864141 | Smoke detector with ionization chamber A smoke detector is provided having an ionization chamber (1). For counterbalancing the removal of ions (51), taken out of the chamber by the violent air currents (C) passing through this chamber, these air currents are previously enriched with... | 09/05/1989 |
| 4853544 | Heat-resistant case for an ionization-type smoke detector and method of making the same An ionization-type smoke detector having a heat-resistant metal case forming the outer electrode and, with an attached rear cover, enclosing the upper portion of an insulating base board. The heat-resistant case includes a cylindrical portion surrounding ... | 08/01/1989 |
| 4845474 | Smoke and fire detector An ionization smoke and fire detector comprises a molded plastic housing that includes a nodal ring for supporting a vibrating plate that is part of an alarm. The alarm may be driven by piezoelectricity or by an electromechanical device. If the detector i... | 07/04/1989 |
| 4761557 | Ionization-type smoke detector In order to provide an ionization-type smoke detector, wherein the radiation from a radioactive source mounted on the inner electrode disposed within the inner ionization chamber also reaches into the outer ionization chamber through a through-hole formed... | 08/02/1988 |
| 4755682 | Ionization monitor with improved ultra-high megohm resistor An ionization monitor measures extremely small currents using a resistor containing a beta emitter to generate ion-pairs which are collected as current when the device is used as a feedback resistor in an electrometer circuit. By varying the amount of bet... | 07/05/1988 |
| 4740703 | Ionization-type smoke detector In an ionization-type smoke detector wherein inner, intermediate and outer electrodes are supported on an insulating base, an inner ionization chamber and an outer ionization chamber being constituted by the inner and intermediate electrodes, and the inte... | 04/26/1988 |
| 4705947 | Pulsed helium ionization detection system A helium ionization detection system is provided which produces stable operation of a conventional helium ionization detector while providing improved sensitivity and linearity. Stability is improved by applying pulsed dc supply voltage across the ionizat... | 11/10/1987 |
| 4704536 | Gas sensor and gas detecting method A gas sensor and a method for detecting a small amount of a gas such as CO contained in air entering a space between electrodes ionized by a radiation source. At least one radiation source is provided for ionizing at least a part of the space between the ... | 11/03/1987 |
| 4684807 | Flow contoured electron capture detector cell A small volume electron capture detector has a cylindrical cell 120 inside which there is provided a generally funnel-shaped insert structure 130 having a cup-shaped section and a cylindrical section. The rims of the cup-shaped section nearly touch the in... | 08/04/1987 |
| 4667106 | Fire identification and discrimination method and apparatus In a method and apparatus for determining the fuel of a fire, an ionization detector is positioned to detect the ionization level in the fire gases. The natural logarithm of the ratio of the ambient ionization current when there is no fire to the change i... | 05/19/1987 |
| 4651008 | Sample inlet system for an electron capture detector An electron capture detector for use with a capillary column is provided with a sample inlet comprising a tubular anode through which sample molecules and a make-up gas are introduced into the detector cell. The tubular anode has side ports for producing ... | 03/17/1987 |
| 4631412 | Ionization smoke detector In a smoke detector of the ionization type having inner, auxiliary and outer electrodes providing inner and outer ionization chambers disposed one within the other, the electrodes and the associated circuitry are mounted on one side of a printed circuit b... | 12/23/1986 |
| 4618777 | Outer electrode with improved smoke entry An outer electrode for a combustion products detector comprising a cylindrical body including a plurality of first slats alternating with a plurality of second slats, the first slats being segments of a first surface of revolution, the second slats being ... | 10/21/1986 |
| 4600314 | Smoke detector cutoff timer A mountable remote cutoff timer for a smoke detector that is powered by a battery and includes a timer that is operatively connected to the battery, a light emitting device for indicating improper connection of the battery, and VELCRO.RTM. for attaching t... | 07/15/1986 |
| 4564762 | Smoke detector An ionization detector unit for use in a smoke detector includes a housing wall enclosing an ionization chamber, the wall having openings for passage of air through the chamber, the frontal surface of the wall that is exposed to an oncoming air flow from ... | 01/14/1986 |
