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| Number | Title | Issue Date |
| 7726177 | Environmental hazard sensor An apparatus for sensing a constituent in an environment including a sensor circuit and a suppression circuit. The sensor circuit has a sensor element and an operating state control element. The sensor element senses the constituent by presenting an electrical param... | 06/01/2010 |
| 7155029 | Method and apparatus of detecting fire by flame imaging An apparatus and method for performing first and second imaging processes contemporaneously, in particular where one of the processes is detecting fires based on images of the flames. The apparatus includes an image sensor for producing a video image, a frame grabbe... | 12/26/2006 |
| 5995008 | Fire detection method and apparatus using overlapping spectral bands An optical fire detector employs two or more sensors operating a different spectral bands. The spectral bands are selected to have approximately coincident cut-off wavelengths in order to make the detector's ability to positively identify a fire more unif... | 11/30/1999 |
| 5850182 | Dual wavelength fire detection method and apparatus A method for extracting a number of temporal frequencies occurring in a fire and false fire condition concurrently from two or more radiation detectors for receiving signals, a correlation detector for each frequency and sensor, and a storage buffer for t... | 12/15/1998 |
| 5810307 | Explosion-proof swivel mounting bracket A swivel mounting bracket for attachment to an electrical junction box and to a detector device, the swivel mounting bracket having two identical fittings. Each fitting has an internal passageway which progresses around a 90° bend, and each fitting has a... | 09/22/1998 |
| 5804825 | Fire detector having wide-range sensitivity A radiation detector having wide-range sensitivity is provided. In accordance with one embodiment of the invention, a radiation detector for detecting a radiation condition is provided. The radiation detector includes a plurality of sensors each of which ... | 09/08/1998 |
| 5475222 | Ruggedized gas detector A ruggedized gas detector having two or more perforated concentric cylinders and having a concentric screen inside the innermost cylinder. A pair of perforated tubes are positioned inside the perforated screen, and an infrared light source is placed adjac... | 12/12/1995 |
| 5473752 | Fault isolation circuit A system for detecting and isolating faults in a two-wire communications loop which includes a number of node circuits dispersed along the loop. Each node circuit executes a fault detection algorithm and selectively switches its connections to adjacent no... | 12/05/1995 |
| 5434560 | System for detecting random events A system for detecting randomly occurring signals, particularly signals representative of a fire condition, having a radiation detector for receiving the signals, peak detector circuits for identifying the peak values of the received signals, peak duratio... | 07/18/1995 |
| 5237512 | Signal recognition and classification for identifying a fire An apparatus and method for sensing electro-magnetic radiation and analysing the resultant electrical signal waveform, in order to determine whether the radiation originates from a fire condition, monitors variations in the signal waveform over a predeter... | 08/17/1993 |
| 5218201 | Method and apparatus for linearizing photoresistive optical sensors with sensitivity-selective masking The linearity of a photoresistive device at varying levels of radiant signal is improved by masking the sensitive area of the photoresistive device so that only a portion of the sensitive area is illuminated. The masking prevents exposure of the entire su... | 06/08/1993 |
| 5006710 | Recognition and processing of waveforms A flame detector has a sensor for producing a digital waveform representing a flickering flame. Its turning points are detected and the magnitudes between successive such points are measured. The value of each such magnitude is plotted on a graph whose ho... | 04/09/1991 |
| 4826316 | Radiation detection apparatus Apparatus for detecting radiation with a light-sensitive radiation receiving tube enclosed in a housing behind a transparent window, the invention including an auxiliary internal light source for testing the optical transmissive properties of the window a... | 05/02/1989 |
| 4742248 | Random signal isolation circuit A random signal isolation circuit connectable to a source of signal generation wherein signals of interest tend to occur at relatively closely spaced intervals, and noise signals tend to occur at random time intervals, including a first multivibrator trig... | 05/03/1988 |
| 4581536 | Radiation detection tube having spurious radiation shield Radiation detection tube having a glass envelope surrounding an anode and cathode, and having a further conductive surface surrounding a portion of the glass envelope in the region of the anode-cathode gap, the exterior conductor electrically coupled to t... | 04/08/1986 |
| 4547673 | Smoke and flame detector Apparatus for detecting flame or smoke, having a radiation detection tube enclosed in a housing, facing the exterior through a transparent window at one end of the housing, and having a radiation source proximate the other end of the housing and external ... | 10/15/1985 |
| 4462319 | Method and apparatus for safely controlling explosions in black liquor recovery boilers Apparatus and method is disclosed for monitoring black liquor recovery boilers to detect the presence of water leakage into the combustion chamber (furnace) of a black liquor recovery boiler, or extinguishing of flame at the black liquor spray nozzles, to... | 07/31/1984 |
| 4405234 | Radiation detection apparatus having refractive light checking feature Apparatus for detecting hazardous radiation with a light sensitive radiation receiving tube enclosed in a housing behind a transparent window, and including an auxiliary internal light source positioned for transmitting light rays into the window and refl... | 09/20/1983 |
| 4162425 | Ultraviolet detection tube quenching circuitry Circuitry directed to the rapid de-ionization of ultraviolet detectors by increasing the mobility of the ionized gases within the tubes which will enable the tubes to more effectively operate at low temperatures. The circuitry includes connecting circuitr... | 07/24/1979 |
| 3952196 | Radiation detection apparatus A device for determining that the optical surfaces through which radiation must travel from a hazardous area of radiation to a radiation detector are free from radiation absorbing material or radiation blocking material, the device including an enclosure ... | 04/20/1976 |
