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| Number | Title | Issue Date |
| 7365648 | Fire alarm A fire alarm for an installation via a housing that is flush with the ceiling, having at least one light source arranged in the housing and at least one light receiver arranged in the housing, as well as a shutter disk, which seals the housing. To prevent the spread... | 04/29/2008 |
| 7342505 | Gas detection apparatus and method for controlling gas sensor A first gas sensing element is provided in a first position to measure a concentration of a gas continuously, and a second sensing element is provided in a second position to measure the concentration of the gas intermittently. The second position is in close proxim... | 03/11/2008 |
| 7310047 | Gas alarm system with wind direction indicator A hazardous gases and wind direction sensor includes a housing having a hazardous gas sensor. The gas sensor sends an output signal to a transmitter at a predetermined frequency upon detecting a hazardous gas. Wind detection is provided by eight LEDs aligned with ei... | 12/18/2007 |
| 7224285 | Gas monitor using electrochemical cell and method of operating A method and apparatus for gas detection uses a sensor such as an electrochemical (EC) cell and includes a feedback control loop to control a pump to establish a first predetermined gas flow rate to the EC cell. The concentration of the gas at the first predetermine... | 05/29/2007 |
| 7117665 | Catalyst degradation determining method A catalyst degradation determining method includes the steps of: controlling an upstream-of-catalyst air-fuel ratio occurring upstream of a first catalyst to an air-fuel ratio that is rich of a stoichiometric air-fuel ratio so that first and second catalysts store o... | 10/10/2006 |
| 7102948 | Resistance change sensor An embodiment includes a resistance change sensor. The resistance change sensor includes a first input connected to a first resistance and a second input connected to a second resistance. The sensor further includes a resistance detector for sensing a resistive chan... | 09/05/2006 |
| 7091870 | Security system and method of security service business A terminal system has a mass spectrometric for inspecting of dangerous substances is installed in an inspection area, and a support system for determining whether or not a dangerous substance is present and identifying the type of the substance, based on the mass sp... | 08/15/2006 |
| 6998991 | Dual carbon monoxide sensor system with control catalyst: new CO and humidity method and apparatus The present invention is a new sensor system with catalyst for control and one with a dummy catalyst. An apparatus and method for rapidly determining the concentration of CO, water vapor, and temperature. One of the major reasons to rapidly determine a small but sud... | 02/14/2006 |
| 6985082 | Carbon monoxide sensor and method of use A sensor and method of use for detection of low levels of carbon monoxide in gas mixtures. The approach is based on the change in an electrical property (for example: resistance) that occurs when carbon monoxide is selectively absorbed by a film of copper chloride (... | 01/10/2006 |
| 6917875 | Method and apparatus for processing and display of diesel injection waveform A signal processing apparatus for detecting and displaying the properties of diesel fuel powered compression-ignition engines senses strain pulses in the fuel injection rail structure to perform a variety of testing functions. Among other capabilities, the apparatus... | 07/12/2005 |
| 6900734 | Capillary-discharge based detector for chemical vapor monitoring A handheld/portable detector for chemical vapor monitoring includes a housing and a discharge chamber that is established therein. The plasma discharge has a relatively small volume, e.g., in the micro-liter range. A first electrode and a second electrode are dispos... | 05/31/2005 |
| 6888467 | Gas detection instrument and method for its operation A gas detection instrument comprises a combustible gas sensor and associated circuitry, which supplies power to the sensor and measures and displays resulting sensor response. The supplied power is switched between timed pulses of electricity and steady state electr... | 05/03/2005 |
| 6850165 | Catalyst deterioration detecting system for an automobile The invention provides a catalyst deterioration detecting system that is capable of detecting the degree of deterioration of each catalyst in a catalyst converter which includes two or more catalysts in series. The catalyst deterioration detecting system of a... | 02/01/2005 |
| 6812708 | Combustible-gas measuring instrument A gas detection sensor system including active and reference elements (Rsense, Rref) are arranged in a modified bridge circuit (12, 14, 22, 24) which allows power (Vbat) to be supplied seperately to the active and reference el... | 11/02/2004 |
| 6801112 | Device for switching a connection according to the state of an apparatus to be monitored, especially a safety switch A device for switching a connection according to the state of an apparatus to be monitored, especially a safety switch, includes an actuator having first signaling device preferably be fixed on the apparatus to be monitored. The actuator can be brought into contact ... | 10/05/2004 |
| 6700484 | Networked miniature chemical optical sensors A network for detecting a substance includes at least two detectors that are capable of transmitting a signal, and a remote station capable of receiving the signal. The detectors are adapted to detect a substance and transmit data that indicates the prese... | 03/02/2004 |
| 6670887 | Apparatus and method for wireless gas monitoring The current invention provides a wireless monitoring system. The system has one or more monitoring devices. Each device can transmit data and receive messages from an output center or alarm system. The output center can also transmit and receive messages.... | 12/30/2003 |
| 6433696 | Carbon monoxide emitting apparatus, carbon monoxide monitor shutoff, and circuit therefor A system for monitoring carbon monoxide in an environment which includes an apparatus emitting carbon monoxide, such as an internal combustion engine. A carbon monoxide sensor measures a concentration of carbon monoxide in the environment and provides an ... | 08/13/2002 |
| 6353395 | Interconnectable detector with local alarm indicator A low power local alarm indicating system for interconnectable detectors enables a viewer to, after the fact, determine which detector or detectors had previously gone into a local alarm. An alarm latch, such as a bistable multi-vibrator circuit, is set e... | 03/05/2002 |
| 6348872 | Gas detector-alarm employing hot-wire gas sensor A gas detector-alarm comprises a hot-wire gas sensor 1 having an actuating power control 7 that supplies pulsed actuating power with a cycle T0 when the concentration of gas detected by the hot-wire gas sensor is lower than a first reference level, with a... | 02/19/2002 |
| 6191696 | Alarm system for hand-held chemical monitor An alarm system for portable chemical monitors comprising a housing configured for attachment to the portable chemical monitor having a twist lock mechanical connector capable of connecting to the portable chemical monitor, at least three pins mounted wit... | 02/20/2001 |
| 6060025 | Systems and methods for catalyst reactivation The invention includes systems and methods which allow reactivation of supported noble metal catalysts. The method involves heating the catalyst in the presence of a gaseous hydrocarbon in the absence of oxidizing agents. Systems of the invention provide ... | 05/09/2000 |
| 5969623 | Gas alarm A gas detector is disclosed which includes a CO sensor and a processor. The CO sensor senses an environmental CO concentration and provides a variable electrical output in response. The processor receives digitized samples of the sensor's electrical outpu... | 10/19/1999 |
| 5895629 | Ring oscillator based chemical sensor A chemical sensor couples a material that changes temperature in response to a chemical condition with an oscillator. The oscillator is coupled to the material to detect the change in temperature in the material so that the frequency of the oscillator cha... | 04/20/1999 |
| 5886638 | Method and apparatus for testing a carbon monoxide sensor A CO concentration monitoring device operating under the control of a processor periodically checks the CO sensor to insure its ongoing integrity and to issue a distinctive audio signal to a user if sensor integrity has become suspect. The periodic integr... | 03/23/1999 |
| 5844492 | Water leakage detection and gas shut-off device A gas leak and cut-off device is provided including a gas-powered hot water heater having a cylindrical configuration with a circular top face, a circular bottom face, and a cylindrical periphery formed therebetween. The bottom face has a plurality of sta... | 12/01/1998 |
| 5841021 | Solid state gas sensor and filter assembly An electrochemical gas sensor is provided, the use of which permits quantitative measurement of volatile gas contaminants in an atmosphere being monitored, generally at ambient temperatures below 100° C. The sensor is constructed of a sensor electrode an... | 11/24/1998 |
| 5764150 | Gas alarm A gas detector is disclosed which includes a CO sensor and a processor. The CO sensor senses an environmental CO concentration and provides a variable electrical output in response. The processor receives digitized samples of the sensor's electrical outpu... | 06/09/1998 |
| 5694118 | Gas detection and alarm system for monitoring gas such as carbon monoxide A gas detection and alarm system and a method thereof for monitoring a predetermined dose of carbon monoxide and other gases in the atmosphere which can be harmful to humans, having a gas detection/alarm device comprising a detection circuit which detects... | 12/02/1997 |
| 5670949 | Carbon monoxide/hydrocarbon thin film sensor A ceramic sensor comprising a thin film of Cux Mn3-x O4 is provided that quantitatively measures the partial pressure of CO and hydrocarbon gases in a flowing system. The sensor is specific to both CO and hydrocarbon gases... | 09/23/1997 |
| 5563578 | Detection of hazardous gas leakage Method and apparatus for the detecting hazardous conditions including the hazardous leakage of carbon dioxide gases by detecting spontaneously a plurality of the conditions which are encoded with a different response for each condition; for the detection ... | 10/08/1996 |
| 5526280 | Method and system for gas detection A system and method for using a gas detecting device that conducts electricity increasingly for increasing concentration of a gas being detected. The temperature of a gas sensor element is regulated to first burn-off impurities on the surface thereof, and... | 06/11/1996 |
| 5365216 | Catalyst monitoring using ego sensors A method of monitoring, while on board an automotive vehicle, one or more of catalyst performance, engine misfire, and combustion quality, the vehicle having an internal combustion engine equipped with a catalyst for converting noxious emissions of the en... | 11/15/1994 |
| 5363091 | Catalyst monitoring using ego sensors A method of monitoring, while on board an automotive vehicle, one or more of catalyst performance, engine misfire, and combustion quality, the vehicle having an internal combustion engine equipped with a catalyst for converting noxious emissions of the en... | 11/08/1994 |
| 5319346 | Conversion from odd to non-zero winding number specification using an extended frame buffer Conversion from odd to non-zero winding number convention for representation of polygons in a graphics system comprises entry of a polygon in a frame buffer using distinguished states. Special scanlines are determined and marked. Special scanlines are tho... | 06/07/1994 |
| 5252949 | Chemical sensor for carbon monoxide detection A ceramic sensor (12) comprising a thin film (14) of Cu1=x Mn2-x O4-y is provided that quantitatively measures the partial pressure of CO gas in a flowing system (22). The sensor is specific to CO gas and is negligibly aff... | 10/12/1993 |
| 5177464 | Catalyst monitoring using a hydrocarbon sensor An on-board monitoring system for an automotive emission catalyst has (i) a test chamber remote from the automobile's engine exhaust gas stream; (ii) apparatus for supplying the chamber with sampled exhaust gases sequestered from the stream; (iii) a singl... | 01/05/1993 |
| 5055269 | Temperature limited catalytic gas detector apparatus A temperature limited catalytic gas detector includes a catalytic gas sensor in one branch of a Wheatstone bridge network. A power supply is connected through a voltage controlled regulator to the bridge network. An instrumentation amplifier measures elec... | 10/08/1991 |
| 4992244 | Films of dithiolene complexes in gas-detecting microsensors Chemical microsensors are fabricated by applying dithiolene transition metal complexes as thin films to chemiresistor devices using the Langmuir-Blodgett technique. The thin films interact with ambient gases and change electrical conductivity upon exposur... | 02/12/1991 |
| 4914424 | Oxygen concentration monitor using galvanic cell type oxygen sensor The invention discloses an oxygen concentration monitor using a Galvanic cell type oxygen sensor. An automatic calibration circuit always calibrates the maximum output of the sensor as the value corresponding to an oxygen concentration of 21%, based on th... | 04/03/1990 |
