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| Number | Title | Issue Date |
| 5966077 | Fire detector A fire detector with a maximum average response time of less than 1.5 minutes is obtained by combining a smoke detector with a CO2 detector that uses NDIR sensor technology. The smoke detector is used to detect smoldering fires and to help prev... | 10/12/1999 |
| 5913203 | System and method for pseudo cash transactions Totally anonymous or effectively anonymous cash-like transactions are accomplished by using a pseudo cash data package converter for inserting a user key into a pseudo cash preliminary data packet through the use of a user insertion key to generate a pseu... | 06/15/1999 |
| 5798700 | False alarm resistant fire detector with improved performance A fire detector having a greatly reduced frequency of generating false alarms. An AND gate is responsive to outputs from first and second fire detector modules that are responsive to the detection of first and second characteristics of a fire, respectivel... | 08/25/1998 |
| 5767776 | Fire detector A fire detector with a maximum average response time of less than 1.5 minutes is obtained by combining a smoke detector with a CO2 detector that uses NDIR sensor technology. The smoke detector is used to detect smoldering fires and to help prev... | 06/16/1998 |
| 5721430 | Passive and active infrared analysis gas sensors and applicable multichannel detector assembles Multichannel infrared detector assemblies for use in the detection and monitoring of gas concentrations are provided. The detector assemblies include a detector housing having a port for receiving infrared radiation therethrough; a substrate mounted withi... | 02/24/1998 |
| 5691704 | Practical and improved fire detector A fire detector which combines an NDIR CO2 gas detector with a photoelectric smoke detector to minimize false alarms by logic means that can be integrated into a single chip that can have an ASIC section and a microprocessor section. The NDIR C... | 11/25/1997 |
| 5502308 | Diffusion-type gas sample chamber Apparatus for measuring the concentration of a gas present in a sample chamber by ambient pressure diffusion employs a nondispersive infrared gas analysis technique. The sample chamber has the form of a tube that is closed at one end, with a source of rad... | 03/26/1996 |
| 5453621 | Enhanced pathlength gas sample chamber The sensitivity of a nondispersive infrared gas analyzer increases with increasing pathlength, which increases the absorption of the infrared radiation by the gas whose concentration is to be determined. The present invention includes the addition of an o... | 09/26/1995 |
| 5444249 | NDIR gas sensor A miniaturized NDIR gas sensor is manufactured using semiconductor micromachining techniques from a semiconductor material such as Si or GaAs. The NDIR gas sensor comprises an optical waveguide, a light source at one end of the waveguide, at least one lig... | 08/22/1995 |
| 5414264 | Enhanced pathlength gas sample chamber The sensitivity of a nondispersive infrared gas analyzer increases with increasing pathlength, which increases the absorption of the infrared radiation by the gas whose concentration is to be determined. The present invention includes the addition of an o... | 05/09/1995 |
| 5408101 | Laser assisted quasi-blackbody radiation source A radiation source is presented that exhibits an improved efficiency of converting input energy into a quasi-blackbody output beam. A wavelength selective element can be included to transit one or more narrow bands of this radiation for use in spectroscop... | 04/18/1995 |
| 5384640 | Gas sample chamber for use with a source of coherent radiation A gas sample chamber that is particularly advantageous for use with a semiconductor laser has the form of an elongated hollow tube with a specularly reflective inside surface, a semiconductor laser located at one end of the tube and a detector located at ... | 01/24/1995 |
| 5369397 | Adaptive fire detector The fire detector includes a carbon dioxide sensor and a microcomputer. When the rate of increase of the concentration of carbon dioxide at the sensor exceeds a threshold, an alarm is produced. The threshold is set at one of three possible levels by the m... | 11/29/1994 |
| 5347474 | Self-calibration of an NDIR gas sensor Some cyclic variables include within each cycle a value that can be determined extrinsically. In such case, the sensed value may differ from the known value by an amount that is a combination of long-term drift of the sensor and random measuring error. Th... | 09/13/1994 |
| 5341214 | NDIR gas analysis using spectral ratioing technique An instrument for determining the concentration of a particular gas that might be present in a sample has no moving parts and is extremely compact and inexpensive. A novel waveguiding structure serves both as an optical element and as the sample chamber. ... | 08/23/1994 |
| 5340986 | Diffusion-type gas sample chamber The improved sample chamber includes an elongated hollow tube closed at one end and having specularly-reflective inwardly facing surfaces. A source of radiation and a detector of radiation are mounted side by side in the open end of the hollow tube, both ... | 08/23/1994 |
| 5335534 | Functional testing method for toxic gas sensors The proper operation of an NDIR toxic gas sensor can be checked by using a non-toxic gas that has an absorption band that overlaps the absorption band used for measuring the toxic gas. The NDIR sensor cannot distinguish which of the two gases is responsib... | 08/09/1994 |
| 5222389 | Multi-channel gas sample chamber A gas sample chamber for use in a gas analyzer consists of an elongated hollow tube having an inwardly-facing specularly-reflective surface that permits the tube to function also as a light pipe for conducting radiation from a source to a detector through... | 06/29/1993 |
| 5215498 | Ventilation controller An affordable ventilation controller comprises a low cost and very stable carbon dioxide sensor and a remote-controlled louvered suction fan equipped with an air filter. The ventilation controller operates independently of any existing heating or cooling ... | 06/01/1993 |
| 5167686 | Catheter system for controlled removal by radiant energy of biological obstructions A catheter for delivering radiant energy, such as a laser beam, is used in a technique to controllably apply the radiant energy in a patient's body, such as in a blood vessel. The radiant energy is applied in a manner which erodes biological material and ... | 12/01/1992 |
| 5163332 | Gas sample chamber A diffusion-type gas sample chamber for use in a gas analyzer consists of an elongated hollow tube having an inwardly-facing specularly-reflective surface that permits the tube to function also as a light pipe for transmitting radiation from a source to a... | 11/17/1992 |
| 5103096 | Rapid fire detector A compact low-cost fire detector responds quickly by detecting an increase in the concentration of carbon dioxide gas in the ambient air. The detector also calculates the rate of build-up of carbon dioxide. The detector avoids the use of moving parts by e... | 04/07/1992 |
| 5079422 | Fire detection system using spatially cooperative multi-sensor input technique A system for detecting fires uses at least two carbon dioxide sensors positioned at spaced locations in a room. Each sensor produces an electrical output signal representative of the carbon dioxide concentration in its vicinity. A computer calculates the ... | 01/07/1992 |
| 5060508 | Gas sample chamber A sample chamber for use in measuring the absorption of radiation as it passes through a gas within the chamber includes a block having an extended serpentine passage through it. The walls of the extended passage are coated with a highly reflective materi... | 10/29/1991 |
| 5053754 | Simple fire detector A fire detector that responds more rapidly than the widely used smoke detectors senses increases in the concentration of carbon dioxide associated with a fire. The build-up of carbon dioxide is sensed by measuring the concomittant increase in the absorpti... | 10/01/1991 |
| 5026992 | Spectral ratioing technique for NDIR gas analysis using a differential temperature source An instrument for determining the concentration of a particular gas that might be present in a sample has no moving parts and is extremely compact. The instrument uses as a source of radiation a device that has a radiating element whose temperature is alt... | 06/25/1991 |
| 4968887 | Gaseous nitrogen detection using excited-state laser spectroscopy When light from a laser diode having a wavelength in the interval from 670 to 880 nm is directed through a sample containing nitrogen molecules, the nitrogen molecules do not absorb the laser light; but if the sample is energized under suitable conditions... | 11/06/1990 |
| 4928703 | Non-contact respiration rate and apnea monitor using pulmonary gas exchange technique An apnea detector uses an active pulsed source of radiation to monitor the respiration of a patient. Radiation from the source is formed into a collimated beam that is directed through the space into which the patient is breathing. The exhaled gases conta... | 05/29/1990 |
| 4850697 | Resonant piezoelectric chopper for infrared radiation Apparatus for inserting and removing several filters from an optical path and for determining at all times the instantaneous positional relationship of each filter with respect to the optical path includes a set of filters mounted on a carrier which is at... | 07/25/1989 |
| 4817601 | Catheter system for controlled removal by radiant energy of biological obstructions A catheter for delivering radiant energy, such as a laser beam, is used in a technique to controllably apply the radiant energy in a patient's body, such as in a blood vessel. The radiant energy is applied in a manner which erodes biological material and ... | 04/04/1989 |
| 4795240 | High speed infrared shutter A shutter having no moving parts and intended for use at infrared wavelengths includes a thin film of vanadium dioxide deposited on an insulative layer of silicon oxide that has been grown on a thin substrate of semiconductive silicon. The layers are in g... | 01/03/1989 |
| 4773428 | Apparatus and method for measuring viscoelastic properties of mammalian cervical mucous An apparatus and method for measurement of viscoelastic properties of mammalian cervical mucous by generating a bulk acoustic wave which is reflected off of a face in contact with the mucous whereby an output which is a function of the viscoelastic proper... | 09/27/1988 |
| 4756622 | Compact apparatus for measuring absorption by a gas The measurement of weak absorption lines is facilitated by the use of a long transmission path length, which is difficult to obtain in compact or portable instruments. In the present invention, light is made to travel through a limited volume of gas thous... | 07/12/1988 |
| 4730112 | Oxygen measurement using visible radiation Apparatus for measuring the absorption of a gaseous sample and particularly suitable for measuring the concentration of gaseous oxygen makes use of a diode laser whose emission wavelength is adjacent to but spaced from the wavelength of a distinct absorpt... | 03/08/1988 |
| 4694173 | Nondispersive gas analyzer having no moving parts A multi-component non-dispersive gas analyzer of a type typically used to measure the concentrations of gases present in automotive emissions and in breath analyzers has no moving parts and employs electrically operated means for effectively inserting and... | 09/15/1987 |
| 4691714 | Rheological testing apparatus and method The device electronically measures fluid viscosity and temperature simultaneously principally for determining the changes in the properties of cervical mucus at the onset of ovulation. Interdigital transducers are used to generate and detect surface and b... | 09/08/1987 |
| 4591721 | Oxygen analysis employing absorption spectroscopy A method and apparatus are described for detecting the presence and amount of elemental oxygen in a sample cell. The intensity of extreme ultraviolet light passing through the sample cell at a wavelength band overlapping at least one of the Schumann-Runge... | 05/27/1986 |
| 4578762 | Self-calibrating carbon dioxide analyzer A carbon dioxide analyzer for medical purposes is rendered self-calibrating by continuously measuring pairs of two or three each of several components as follows: 1st pair: vacuum cell, open hole and sample cell reference cell, open hole and sample cell 2... | 03/25/1986 |
| 4384543 | Combined underinflation indicator and relief valve This invention provides a screw-on device for valve stems of automobile tires which will indicate to an automobile operator when a particular tire is under the selected standard psi. The indicator is a visible device that projects towards the outer end of... | 05/24/1983 |
