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| Number | Title | Issue Date |
| 4785295 | Optical media monitoring device In an optical media monitoring device that detects presence of light-interrupting media between a photoemitter component and a photoreceptor component provided to operate in cooperation with each other, the photoemitter component is driven at a variable l... | 11/15/1988 |
| 4719360 | Method for determination of concentration of smoke emanating from combustion engine and apparatus for working said method Concentration of a smoke emanating from a combustion engine is determined by projecting beams of light on the flow of smoke in directions traversing the flow of smoke, detecting intensities of beams of light which have traversed the flow of smoke with a l... | 01/12/1988 |
| 4717862 | Pulsed illumination projector A pulsed illuminator projector for reducing the reverberation levels of rected ligh by illuminating a lamp that is pulsed on and off at a specified rate and for a specified time duration. The critical factor is controlling the amount of time the light is... | 01/05/1988 |
| 4700079 | Light-transmission type smoke detector having a spiral optical path In a light-transmission type smoke detector, a smoke chamber is composed of a disc-like block of a non-conductive material one side of which has a spiral groove and is coated with a conductive bright metal film and a casing mounted on the block, said casi... | 10/13/1987 |
| 4688943 | Fluid optical density (opacity) probe An apparatus and method for determining the extinction of laser light through a fluid is disclosed. The fluid is passed in a conduit having a light transmissive window. A laser beam having intensity I1 is passed through the window into the flui... | 08/25/1987 |
| 4680827 | Vacuum cleaner In a vacuum cleaner for industry and household in which the speed control for the blower motor for the vacuum cleaner is effected by evaluating the dust concentration given at any time in the suction line by opto-electrical means (light transmitters, ligh... | 07/21/1987 |
| 4681086 | Viewing instrument for chimney An instrument for viewing the vent of a chimney while the chimney is working that includes a quartz rod that is mounted in the chimney above the flue entrance thereto. The rod is adapted to transmit light travelling down the chimney to a viewing station o... | 07/21/1987 |
| 4647780 | Apparatus for measuring smoke density Smoke density measuring apparatus comprising a duct (1) through which the smoke passes, a light source (4) and a photodetector (6) located on opposite sides of the duct adjacent openings (2,3) in the side walls of the duct so that the source (4) directs a... | 03/03/1987 |
| 4640621 | Transmissometer and optical elements therefor A transmissometer includes electronic shutters for interrupting the transmitted and reference light beams at selected locations and at selected time intervals for establishing the various modes of operation of the transmissometer. The electronic shutters ... | 02/03/1987 |
| 4614968 | Contrast smoke detector A system for detection of smoke by measuring changes in the contrast of a multi-contrast target disposed remotely from a photoelectric sensor. The obscuration of the detection path causes a reduction in the contrast of the sensed target, and a change of p... | 09/30/1986 |
| 4606644 | Gas measuring apparatus with means to reduce thermal radiation effects A gas measuring device has a source capable of emitting a beam of radiation aligned to impinge a detector. A housing means encloses the beam. The housing means has a plurality of apertures permitting the gas to enter the housing means, to intercept the be... | 08/19/1986 |
| 4601082 | Vacuum cleaner Vacuum cleaner for use in industry and household comprising a housing and an electric motor driving the blower generating the working vacuum, and optional maneuvering means for moving a suction nozzle over the material to be cleaned. There is provided in ... | 07/22/1986 |
| 4600314 | Smoke detector cutoff timer A mountable remote cutoff timer for a smoke detector that is powered by a battery and includes a timer that is operatively connected to the battery, a light emitting device for indicating improper connection of the battery, and VELCRO.RTM. for attaching t... | 07/15/1986 |
| 4594581 | Fire alarm system An alarm system for serving notice of abnormalities such as fire, burglary or other malfunctions has extinction-type separated smoke detectors which detect smoke by exploiting the phenomenon that the intensity of a light beam emitted by a light transmitte... | 06/10/1986 |
| 4583859 | Filter cleaning system for opacity monitor A filter cleaning system for an opacity monitor which has a light source and a light sensor on opposite sides of a first optical path through a gas whose opacity is to be measured, comprises a mechanism for calibrating the opacity monitor during a calibra... | 04/22/1986 |
| 4580311 | Protective device for dust collecting devices Protective device for dust collecting devices, in particular vacuum cleaners such as wheel-mounted or hand vacuum cleaners, whereby the presence of any dust behind the dust collecting vessel, due to a damage to the dust collecting vessel, is detected by m... | 04/08/1986 |
| 4561722 | Beam divider A beam divider which is particularly intended for use in smoke measuring apparatus comprises a transparent beam dividing plate (11) which is obliquely arranged in the beam path and is partially silvered at its lower side (11'). Two protective plates (13, ... | 12/31/1985 |
| 4547675 | Smoke detector operating according to the radiation extinction principle A smoke detector contains two radiation transmitters and two radiation receivers. Each of the radiation transmitters emits in a different spectral region, for instance, one emits above and the other one below 600 nm. One part of the radiation of both radi... | 10/15/1985 |
| 4544273 | Smoke opacity meter Apparatus for controllably admitting a sample volume of engine exhaust into a bifurcated, closed-loop opacity chamber and wherein the exhaust sample is controllably directed away from the internal optics via symmetric flow inducing air guides. A pulsed li... | 10/01/1985 |
| 4543815 | Device for the detection of foreign components in a gas and an application of the device An aerosol detector, for instance a transmission measurement path in a measurement chamber, is provided for the detection of a foreign component in a gas, for instance of incendiary aerosols or smoke in air, and communicates with a reference chamber conta... | 10/01/1985 |
| 4474472 | Arrangement for the detection of particles in a gas flow A measuring system for the detection of particles in a gas flow utilizes a light source, a light detector for receiving light from the light source, and an evaluating circuit connected to the light detector. A hollow body having a longitudinal portion and... | 10/02/1984 |
| 4432649 | Optical apparatus for measuring transmission or absorption along a measurement path A light transmitter transmits a beam of light along a measurement path to a light receiver which receives the light beam either directly or via a retro-reflector. The light receiver forms electrical signals representative of the transmission or absorption... | 02/21/1984 |
| 4413911 | Gas analyzer with fluid curtain A gas analyzer capable of measuring select properties of gas includes a source for emitting a beam of radiation and a detector for receiving the radiation, with the beam aligned to impinge the detector. A housing for enclosing the beam has two apertures p... | 11/08/1983 |
| 4389576 | Installation to measure the visibility limit in a fog Installation to measure the limit of visibility in a fog, comprising a motor of a control device effecting the setting of the variable focus of the optical apparatus (1) and simultaneously driving one or several moving assemblies (8) displaceable with res... | 06/21/1983 |
| 4386854 | Method and means for optically generating signals for use in monitoring an environment using tomographic techniques The environment within an area is monitored through use of tomographic reconstruction techniques. Signals for use in the tomographic reconstruction are generated optically by a laser which transmits signals to reflectors positioned about the area and then... | 06/07/1983 |
| 4333724 | Photoelectric detector In a photoelectric detector having a light transmitting section and a light receiving section disposed remote from each other, intermittent illumination of a light source of the light transmitting section is detected and processed by the light receiving s... | 06/08/1982 |
| 4320975 | Passive smoke plume opacity monitor In the smoke opacity monitor disclosed herein, a measurement of opacity is obtained by measuring the proportion of polarized light from the background sky which is detectable through the smoke plume. Compensation and normalization is provided to minimize ... | 03/23/1982 |
| 4317113 | Photoelectric smoke sensor In a photoelectric smoke sensor which produces a fire alarm signal when an amount of attenuation of received light exceeds a predetermined level due to smoke flowing into a space between light emitting and light receiving devices, the level of a receiving... | 02/23/1982 |
| 4305069 | Personal smoke and fire detector and warning unit This invention is a combination smoke and fire detection and alarm system that comprises a battery powered personal unit and an AC/DC sustaining unit. It provides audible and visual alarms and an emergency light. The personal unit plugs into the sustainin... | 12/08/1981 |
| 4266218 | Alarm system control circuit A circuit for reducing or eliminating the sensitivity of alarm circuitry to false alarms caused by noise occurring synchronously with a 60 Hz line voltage. The 60 Hz line signal is applied to a variable-threshold circuit which produces a 60 Hz clock signa... | 05/05/1981 |
| 4247205 | Gas measuring apparatus with standardization means, and method therefor An apparatus and a method for standardizing a gas measuring device has a source capable of emitting a beam of radiation aligned to impinge a detector and gas particles. A hollow, open-ended tube is used as a standardization means and is placed adjacent to... | 01/27/1981 |
| 4206630 | Sample chamber for gas analyzer A sample chamber for a gas analyzer for use in a duct containing gases to be analyzed is disclosed and includes a flow directing apparatus formed by a pair of spaced members which form a passage therebetween in the form of a converging diverging throat an... | 06/10/1980 |
| 4206456 | Smoke detector A photo-electric smoke detector operating on the reflected light principle which has a rate detector for detecting the rate of increase of smoke concentration. When the rate exceeds a predetermined value, the rate detector causes the intensity of the smok... | 06/03/1980 |
| 4205550 | Sample chamber for gas analyzer In a duct having a gas of predetermined density and viscosity flowing therethrough at a predetermined velocity, a sample chamber for a gas analyzer for use in such a duct is disclosed and includes an inner chamber having a passage therethrough and an oute... | 06/03/1980 |
| 4197013 | Calibration of dust monitoring instruments Disclosed is a method and apparatus for calibrating and recalibrating a photometric measurement instrument which supervises the presence of dust in a particular location as produced by a process during which dust is developed on an irregular basis. The me... | 04/08/1980 |
| 4185278 | Obscuration type smoke detector Miniaturized smoke detectors, which operate on a light obscuration principle and may be either AC or battery operated, are both optically and electrically balanced whereby an unbalance resulting from the presence of smoke will trigger an alarm. The smoke ... | 01/22/1980 |
| 4180742 | Detector with supervisory signal from monitor cell A smoke detector system utilizing remote detectors of the photo-electric type connected to a central control panel. In one embodiment means is provided for monitoring both the signal lead and power lead, and in another embodiment, means is also provided f... | 12/25/1979 |
| 4168438 | Light scattering type smoke detector A light scattering type smoke detector having an improved labyrinth high in shielding effects for interior detecting means from the exterior light and other obstacles such as dusts, insects or the like than smoke particles is provided. The labyrinth compr... | 09/18/1979 |
| 4160246 | Wireless multi-head smoke detector system A wireless smoke detector apparatus including at least one detector/transmitter unit and a receiver/annunciator unit. The detector/transmitter having a pulsed infrared radiation source, a photodetector having an optical axis angularly intersecting the axi... | 07/03/1979 |
| 4156816 | Optical fire-detector The invention relates to an optical fire-detector in which a radiation-emitting means is arranged to emit a beam of radiation and which has modulator means for the modulation of the beam of radiation in a phase-inverted relationship within a first and a s... | 05/29/1979 |
