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| Number | Title | Issue Date |
| 7271720 | Homeland intelligent systems technology “H-LIST” Homeland Intelligence Systems Technology “H-LIST” comprises nano-sensors embedded in a silicon substrate and etched/fused in a micro-fibered material to enable an outfit for monitoring suspicious terrorist activities and for track biological and chemical gases, ... | 09/18/2007 |
| 7236095 | Solid state sensor for carbon monoxide A method of detecting a predetermined alarm condition in a combustion emission gas. The method comprises exposing to the gas a semiconductor gas sensor having a p-type mixed metal oxide semiconducting material of the first, second and/or third order transition metal... | 06/26/2007 |
| 7183933 | Garage carbon monoxide detector with automatic garage door opening command A garage monitoring system for use with an automatic garage door opening mechanism that includes a carbon monoxide detector configured to sense the presence of carbon monoxide within the garage and generate an audible alarm when carbon monoxide reaches a predetermin... | 02/27/2007 |
| 7129847 | Detector with dust filter and airflow monitor A device for monitoring changes in airflow rates through detector dust filters in addition to assessing air for alarm indicators, including smoke, heat, gas, and relative humidity, is provided. A method monitors airflow through the detection device and provides a ma... | 10/31/2006 |
| 7109874 | Smoke detectors A smoke detector unit (20) comprising a housing containing a smoke detector (24) and at least two component mounting boards, such as printed circuit boards, in a stacked arrangement, the housing having at least one air gap (34), wherein one of t... | 09/19/2006 |
| 7071832 | Electronic digital pressure switch An electronic digital pressure switch for detecting gas pressures features improved safety. The digital pressure switch that detects gas pressures and generates outputs has a housing provided with pinholes that allow a gas to pass therethrough. With this arrangement... | 07/04/2006 |
| 7028530 | Gas detector There is provided a gas detector capable of detecting hydrogen concentration and humidity independently in the environment containing both hydrogen and water vapor. The gas detector comprises a high-temp exothermic detector unit and a low-temp exothermic detector un... | 04/18/2006 |
| 7021925 | Safety module for fuel-burning appliance, and appliance using such a module The invention provides a safety module for connection to a fuel-burning appliance. The safety module connects to the existing circuitry of the appliance and triggers an alarm response when certain predetermined conditions are met. The safety module includes a CO sen... | 04/04/2006 |
| 6955787 | Integrated biological and chemical sensors An array of piezoelectric resonators used in a sensor device in order to identify chemical and biological agents. The resonators can operate as bulk acoustic wave (BAW), surface acoustic wave (SAW), or Love mode devices. The sensor device integrates gravimetric, cal... | 10/18/2005 |
| 6948388 | Wireless remote sensor A sensing system includes a ring oscillator that emits electromagnetic radiation at a characteristic frequency. The ring oscillator comprises an odd number plurality of inverters that are electrically connected in series. The sensing system also comprises a temperat... | 09/27/2005 |
| 6927066 | Process for the determination of MTBE in the ground and air A process is described, and also the system for its embodiment, for the determination of pollution by MTBE in the soil and in the overlying atmosphere. An example is described relating to the monitoring of underground fuel tanks for autotraction containing an oxygen... | 08/09/2005 |
| 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 |
| 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 |
| 6642849 | Hush disable feature for photoelectric smoke alarm A hush mode disabling device for a smoke alarm having a self-test function, a hush mode that engages upon activation of the self-test function to silence or desensitize the smoke alarm for a predetermined period of time, and a remote self-test controller.... | 11/04/2003 |
| 6634213 | Permeable protective coating for a single-chip hydrogen sensor A permeable protective coating for a single-ship hydrogen sensor. A hydrogen-permeable coating is applied to a semiconductor wafer containing hydrogen sensor dies, prior to dicing of the wafer. The permeable coating is preferably an organic spin-on polyme... | 10/21/2003 |
| 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 |
| 6285291 | Detection of airborne pollutants A smoke detection system comprises a manifold (4) connected to a series of sampling pipes (2). A fan (6) which draws a large volume of sampling air through the sampling pipes is connected to the inlet manifold and a small proportion of that air is directe... | 09/04/2001 |
| 6211647 | Method enabling communications between an electronic device and a battery, an apparatus comprising an electronic device and a battery, and a battery enabling communication A method enables digital, serial communication over an interface between an electronic device (102) and a battery (103) attached thereto. The digital, serial communication comprises transmission of bytes (300) consisting of a number of bits. The method co... | 04/03/2001 |
| 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 |
| 6085576 | Handheld sensing apparatus A vapor sensing device that is sufficiently small and lightweight to be handheld, and also modular so as to allow the device to be conveniently adapted for use in sensing the presence and concentration of a wide variety of specified vapors. The device pro... | 07/11/2000 |
| 6055848 | Air quality measuring device The present invention provides a device for measuring air quality. The device includes at least one sensor with a sensor resistance which is converted via signal processing into an output signal, the gas sensing or air content sensing device having its se... | 05/02/2000 |
| 6024924 | Biosensor system for detecting organic trace compounds produced by smoldering fires In a biosensor system for detecting trace compounds resulting from a fire or from plants damaged by destructive insects, a live chemoreceptor is provided for sensing the trace compounds, and a semiconductor component is connected to the chemoreceptor for ... | 02/15/2000 |
| 5990798 | Atomic absorption photometer with a safety monitor An atomic absorption photometer includes a microprocessor which is programmed so as to affirmatively create an unsafe condition by lowering the pressure inside the flow route of a combustion improving gas and to check if the gas switch in this flow route ... | 11/23/1999 |
| 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 |
| 5945069 | Gas sensor test chip A polymeric gas sensor utilizes a variety of electrode geometries to generate varied responses to selective gases. The characteristic response to various gases of each electrode geometry permits the construction of a gas sensor having desirable and reprod... | 08/31/1999 |
| 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 |
| 5838243 | Combination carbon monoxide sensor and combustion heating device shut-off system A new Combination Carbon Monoxide Sensor and Furnace Shut-Off System for automatically terminating natural gas flow to a malfunctioning boiler or furnace which is producing dangerous levels of carbon monoxide. The inventive device includes a carbon monoxi... | 11/17/1998 |
| 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 |
| 5644730 | Dual mode binary sensor for bus operation A binary sensor including a binary sensing circuit, a logic circuit and an adaptive interface card adapted to matingly engage the binary sensor. The binary sensing circuit and logic circuit are operatively coupled for communication with external circuits.... | 07/01/1997 |
| 5625209 | Silicon based sensor apparatus A biomedical sensor (20) is formed on a semiconductor substrate (22). Insulated dielectric layers (23, 24) are formed on the face and backside of the semiconductor substrate (22). Metal leads (26, 28) contact the substrate (22) through openings in the die... | 04/29/1997 |
| 5618496 | Gas sensors and their manufacturing methods P-type semiconductor 15 and n-type semiconductor 16 are formed as thick films or spray-coated onto electrodes 13 and 14 on top of substrates 11 and 12, with films of p-type semiconductor 15 and n-type semiconductor 16 being formed in such manner that they... | 04/08/1997 |
| 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 |
| 5551283 | Atmosphere measuring device and flow sensor A low-cost and quick-response type gas-density sensing element is free from positioning error of sensing ambient temperature and gas density and can accurately sense the gas flow even if the environmental conditions sharply change. An output voltage V | 09/03/1996 |
| 5528225 | Gas detecting method and apparatus A gas detecting method and apparatus for selectively detecting a fuel gas having methane as a main component thereof and an incomplete combustion gas having carbon monoxide as a main component thereof. A low heat capacity, hot-wire semiconductor type gas ... | 06/18/1996 |
| 5517182 | Method for CO detection and its apparatus A CO detector, utilizing periodical temperature change of a metal oxide semi-conductor gas sensor, is equipped with a backup battery. When power cut of a commercial power supply is detected, the detector will be driven by the battery, and the gas sensor w... | 05/14/1996 |
| 5457333 | Gas sensor used in leak detectors or alarm units The invention relates to a gas sensor comprises a precious metal electrode, a semiconductor layer entirely or partly covering the precious metal electrode, a barrier layer having a high potential formed at an interface between the precious metal electrode... | 10/10/1995 |
