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Document Title |
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7504958 |
System and method for detection and identification of airborne hazards
Various embodiments of a system for detecting airborne hazards in a gaseous environment are disclosed. An embodiment of the system includes a plurality of sets of one or more detectors, where the...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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 T 0 when the concentration of gas detected by the...
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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...
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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...
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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...
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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,...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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,...
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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...
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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...
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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...
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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...
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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...
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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...
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5446450 |
Genus tower light controller
A tower light controller comprises logic circuitry that easily connects with equipment used in the production of semiconductor wafers. The tower light controller uses the existing signals in the...
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5419358 |
Gas monitoring system for a boiler
A gas monitoring system for use with a gas-fired boiler in a house or the like. The boiler is supplied with flammable gas. The system comprises a transducer, a visible and audible alarm circuit, a...
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5400643 |
Gas sensor based on semiconductor oxide, for gaseous hydrocarbon determination
A sensor device for gaseous hydrocarbons includes two semiconductor oxide-based sensitive elements, one of which is a sensitive reference element and the other a sensitive measuring element, this...
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5376924 |
Fire sensor
A fire sensing method and apparatus for detecting a fire based on the detection of a hydrocarbon gas produced before fire ignition and the detection of a second fire indicating phenomenon. Such...
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5218347 |
Apparatus for detecting hazardous gases
A new and improved gas detection, concentration and warning apparatus is disclosed which includes a tin dioxide semiconductor gas sensor operated with a load resistor of a preselected value and...
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5065613 |
Method for the direct presentation of a differential measured quantity in terms of its correct physical unit
A method for the direct presentation of a differential measured quantity, in particular, a differential gas concentration measurement, in terms of its correct physical unit is disclosed. A...
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5066466 |
Apparatus for indicating the presence of toxic substances in air that is supplied to a personnel-occupied space
The present invention relates to a device for indicating toxic substances in air that is supplied to accommodation used for personnel, preferably the cab of a motor vehicle, this having error...
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5065140 |
Early warning reactive gas detection system
A reactive gas detection system provides early warning of gas emissions that often occur in developing fire conditions in environments such as telephone system central offices where halogenated...
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4992965 |
Circuit arrangement for the evaluation of a signal produced by a semiconductor gas sensor
A circuit for the evaluation of a signal produced by a semiconductor gas sensor provides a reliable control for manipulating a recirculated air valve in motor vehicles and their air-conditioning...
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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...
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4911892 |
Apparatus for simultaneous detection of target gases
A gas sensing thick film is positioned on an insulating substrate in contact with a pair of electrodes. A non-porous glass layer surrounds the film to stabilize it on the substrate. A heating...
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4912338 |
Safety system for a gas operated appliance in a vehicle
The present invention is a safety system for a gas operated appliance in a vehicle. The system includes means for generating an electrical signal, such as a pre-determined voltage. The system also...
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4896143 |
Gas concentration sensor with dose monitoring
A tin oxide carbon monoxide sensor is operated in a manner to exclude effects of ambient temperature and humidity. Resistance of the sensor is measured at a lower temperature and again at a higher...
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4839767 |
Element and device for detecting internal faults in an insulating gas charged electrical apparatus
An element for detecting internal faults in an insulating gas charged electrical apparatus comprises a substrate disposed in the electrical apparatus charged with an insulating gas, a pair of...
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4795968 |
Gas detection method and apparatus using chemisorption and/or physisorption
Gas species are detected with a capacitor having a solid, ionic dielectric excited by an AC voltage in the range from 0.01-30 Hz, with an amplitude of 1-100 millivolts to allow physisorption...
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4782334 |
Vapor or gas detector and alarm system
A vapor or gas detector (12) that forms an element of a vapor or gas detecting and alarm system (30). The detector in one of its embodiments is configured as a three-section dynamic junction (16)...
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4779078 |
Combustible gas detector
A combustible gas detector having a transformer, a gas detector, a buzzer, a capacitor connected in parallel with the buzzer, an electronic switch, and two resistors. The gas detector has a...
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4761639 |
Lightweight, compact detector of sudden changes in concentration of a gas
Lightweight, compact apparatus for detecting sudden changes in the concentration of at least one selected gas provides a warning when said gas concentration increases suddenly. In one embodiment, a...
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4706493 |
Semiconductor gas sensor having thermally isolated site
A preferred semiconductor gas sensor of this invention features a gas interaction site comprising a gas sensitive semiconductor thin film and means for heating the film to an operative temperature....
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