Did You Know...
...that two musicians were responsible for the invention of color print film? Fascinated by photography, Leopold Godowsky and Leopold Mannes worked together to produce an easy-to-use, practical color film. They worked full time as music teachers and gave concerts while experimenting during their off hours in Mannes' kitchen. Their success earned them full-time, well-paying jobs at Kodak and their efforts resulted in Kodachrome film, which was introduced in 1935.
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| Number | Title | Issue Date |
| 7456411 | He-3 neutron proportional counter with internal leakage detection and related method A radiation detector includes a pressure-tight housing having a peripheral, cylindrically-shaped wall and opposite end closures. An electrode wire extends through a center of the housing, spaced from the cylindrically-shaped wall. A pressurized detector gas fills th... | 11/25/2008 |
| 7402800 | Method and device for the continuous determination of damage to systems used for the post-treatment of heat engine exhaust gases The invention relates to a method for the continuous determination of the damage to at least one system (7) used for the post-treatment of exhaust gases from an internal combustion engine (2), caused by the lubricating oil, the fuel and/or at least one... | 07/22/2008 |
| 7336165 | Retrofitting detectors into legacy detector systems The disclosure includes improvements in the field of retrofit-detector installation such as adapters that simplify retrofit of addressable detectors onto previously installed zone-type system hardware. Each adapter includes electrical circuitry for electrically conn... | 02/26/2008 |
| 6976883 | Adaptor apparatus and method for interchanging smoke alarms An adapter configured for use between an alarm device and a wire harness. The adapter includes a housing having first and second sides, a circuit board positioned at least partially within the housing, and a first connection configuration associated with the first h... | 12/20/2005 |
| 6953936 | Ionization type smoke sensing chamber A modular smoke detector has a sensing electrode carried by an insulator module. The insulator module also carries an ionization source and a field effect transistor. The insulator module lockingly engages a printed circuit board. A conical smoke deflector and exter... | 10/11/2005 |
| 6904784 | Liquid chromatographic method and system To economically perform preparatory chromatography, a plurality of pumps each having a corresponding one of a plurality of pistons and a corresponding one of a plurality of cylinders are driven by one motor to draw and pump solvent simultaneously into corresponding ... | 06/14/2005 |
| 6606899 | Total impurity monitor for gases A device for measuring a total concentration of impurities in a sample gas is provided which includes a housing having an inlet to allow the sample gas to enter the housing, an emitter to generate ions from the sample gas, a field gradient to accelerate t... | 08/19/2003 |
| 6567346 | Absolute time scale clock An absolute time scale clock includes a radioactive isotope and a computer. The computer includes a processor that determines an indication of the current absolute time and a memory that stores a decay constant of the radioactive isotope, a reference time... | 05/20/2003 |
| 6365902 | Radiation detector, an apparatus for use in radiography and a method for detecting ionizing radiation A detector for detection of ionizing radiation, an apparatus for use in planar beam radiography, comprising such a detector, and a method for detecting ionizing radiation. The detector includes a chamber filled with an ionizable medium, at least one first... | 04/02/2002 |
| 6362743 | Smoke alarm with dual sensing technologies and dual power sources A smoke alarm having both an ionization detector and a photoelectric detector coupled to each other to generate an alarm signal when either of the detectors senses a potential fire. The smoke detector includes a power supply circuit having both an AC powe... | 03/26/2002 |
| 6320261 | High aspect ratio metallization structures for shallow junction devices, and methods of forming the same A contact interface having a substantially annular silicide ring along sides of a depression formed in an active surface of the semiconductor substrate, wherein the depression is formed by an etching process to form a contact opening through a dielectric ... | 11/20/2001 |
| 6320388 | Multiple channel photo-ionization detector for simultaneous and selective measurement of volatile organic compound A multiple-channel photo-ionization detector (PID) determines the concentrations of specific gases or classes of gases. The PID includes a UV lamp, an optical window which is divided into multiple zones with each zone producing a UV light beam having a di... | 11/20/2001 |
| 6288400 | Portable apparatus for the measurement of environmental radon and thoron The radometer is a portable instrument for the measurement of the concentration of atmospheric radon/thoron in a test area. A constant velocity pump pulls the air from the outside at a constant flow rate. If the air is too moist, some or all of the sample... | 09/11/2001 |
| 6107805 | Extended detection zone in an ionization detector An ionization detector for detection of an analyte includes a source chamber having a source of ionizing particles and receiving a fluid stream of detector gas; an ionization chamber connected to the source chamber at an ionization chamber entrance thereb... | 08/22/2000 |
| 5920072 | Ionization detector An ionization detector having an upper ionization chamber, a lower ionization chamber, and a radioactive source located in the upper ionization chamber but shielded from the lower ionization chamber by a barrier. A substantially constant fluid stream of d... | 07/06/1999 |
| 5679958 | Beta particle monitor for surfaces A beta radiation detector which is capable of reliably detecting beta radiation emitted from a surface. An electrically conductive signal collector is adjustably mounted inside an electrically conductive enclosure which may define a single large opening f... | 10/21/1997 |
| 5633501 | Combination photoelectric and ionization smoke detector An ionization chamber for use in a smoke detector includes first and second outer electrodes and a non-reflective center electrode. The non-reflective center electrode can be formed as a metal electrode having a non-reflective coating or as a non-reflecti... | 05/27/1997 |
| 5399864 | Ionization type smoke detector An ionization type smoke detector includes a detector body, a printed circuit board on the upper surface of the detector body, an electrode mount on the upper surface of the printed circuit board, an inner electrode securing the electrode mount onto the p... | 03/21/1995 |
| 5400013 | Ionization type smoke detector An ionization type smoke detector includes a smoke detecting section including an intermediate electrode and an outer electrode to confine an outer ionization chamber therebetween into which smoke to be detected is introduced, and a reference resistance s... | 03/21/1995 |
| 5223712 | Closed loop ionization apparatus for detecting trace gases A trace gas detector including in a closed gas loop, two baffle cells with an intermediate trace gas filter, each baffle cell consists of an ionization source, a labyrinth-like recombination zone and a collector electrode. A differential circuit derives a... | 06/29/1993 |
| 5184019 | Long range alpha particle detector An alpha particle detector capable of detecting alpha radiation from distant sources. In one embodiment, a high voltage is generated in a first electrically conductive mesh while a fan draws air containing air molecules ionized by alpha particles through ... | 02/02/1993 |
| 5180917 | Self-calibrating proportional counter The invention relates to a method and an apparatus for qualifying the operation of a radiation (e.g. neutron) detector containing an ionizable gas (e.g. He3), such as a detector disposed in a logging sonde designed to be lowered in a well, wher... | 01/19/1993 |
| 5153520 | Identifying and quantifying the presence of alpha radiation and specific gaseous molecules present in air samples Means and methods of detecting particular particles in an air stream at very low concentration levels and identifying the particles and magnitude of concentration are afforded. Thus, a particle detector cell has a source of ionizing radiation of constant ... | 10/06/1992 |
| 4864141 | Smoke detector with ionization chamber A smoke detector is provided having an ionization chamber (1). For counterbalancing the removal of ions (51), taken out of the chamber by the violent air currents (C) passing through this chamber, these air currents are previously enriched with... | 09/05/1989 |
| 4853544 | Heat-resistant case for an ionization-type smoke detector and method of making the same An ionization-type smoke detector having a heat-resistant metal case forming the outer electrode and, with an attached rear cover, enclosing the upper portion of an insulating base board. The heat-resistant case includes a cylindrical portion surrounding ... | 08/01/1989 |
| 4845474 | Smoke and fire detector An ionization smoke and fire detector comprises a molded plastic housing that includes a nodal ring for supporting a vibrating plate that is part of an alarm. The alarm may be driven by piezoelectricity or by an electromechanical device. If the detector i... | 07/04/1989 |
| 4786811 | Ionization type-smoke detector An ionization-type smoke detector having inner and outer ionization chambers, a radioactive source to ionize the air within the inner and outer ionization chambers and a printed board to mount electrical circuits for detecting electrical potential at the ... | 11/22/1988 |
| 4761557 | Ionization-type smoke detector In order to provide an ionization-type smoke detector, wherein the radiation from a radioactive source mounted on the inner electrode disposed within the inner ionization chamber also reaches into the outer ionization chamber through a through-hole formed... | 08/02/1988 |
| 4705947 | Pulsed helium ionization detection system A helium ionization detection system is provided which produces stable operation of a conventional helium ionization detector while providing improved sensitivity and linearity. Stability is improved by applying pulsed dc supply voltage across the ionizat... | 11/10/1987 |
| 4704536 | Gas sensor and gas detecting method A gas sensor and a method for detecting a small amount of a gas such as CO contained in air entering a space between electrodes ionized by a radiation source. At least one radiation source is provided for ionizing at least a part of the space between the ... | 11/03/1987 |
| 4618777 | Outer electrode with improved smoke entry An outer electrode for a combustion products detector comprising a cylindrical body including a plurality of first slats alternating with a plurality of second slats, the first slats being segments of a first surface of revolution, the second slats being ... | 10/21/1986 |
| 4595914 | Self-testing combustion products detector A self test circuit for a combustion products detector automatically periodically tests whether the sensitivity of the sensor is in a predetermined range between minimum and maximum sensitivities. Transistor switches selectively connect different test imp... | 06/17/1986 |
| 4594512 | Ionization type smoke detector An ionization type smoke detector for fire alarm comprises an inner ionization chamber (a) defined by an inner electrode (6) and an intermediate electrode (8), an outer ionization chamber (b) defined by the intermediate electrode (8) and an outer electrod... | 06/10/1986 |
| 4567368 | Bipolar pulsed electron capture detectors In operating an ECD in constant current mode, two pulses are implemented either to the same electrode or to separate electrodes, thereby dispersing the space charge sheath near the collector electrode and thus enhancing electron extraction at high frequen... | 01/28/1986 |
| 4524351 | Smoke detector In a smoke detector of the type in which smoke is detected in a detection chamber based upon a variation of an ionization current flowing therein or a variation of light beam passing therethrough, there is provided a reference signal generating section wh... | 06/18/1985 |
| 4511889 | Surge protected smoke alarm A smoke alarm for responding to alarm conditions using electrical circuitry having a horn coil placed in series with rectifier circuitry. The series connection of the horn coil with the rectifier circuitry enables suppression of line transients and also e... | 04/16/1985 |
| 4475390 | Smoke detector A smoke detector containing at least one smoke measuring chamber which possesses a mounting or socket plate having an upper surface intended to be mounted at the ceiling of a room or other appropriate area to be monitored and a housing enclosing the smoke... | 10/09/1984 |
| 4450409 | Pressure sensor and leak detector A leak detector comprising a housing having an axis on first and second compartments spaced along the axis and hermetically separated by a partition, the first compartment being closed to comprise a pressure envelope which is in communication with an evac... | 05/22/1984 |
| 4401979 | Electrical controls for ionization smoke detector An ionization smoke detector device including means for insuring that adjustment can be made in the triggering potential for the alarm device so that should circumstances change, an operator can make a simple adjustment to take into account the changed ci... | 08/30/1983 |
| 4384488 | Smoke detector A smoke detector containing at least one smoke measuring chamber which possesses a mounting or socket plate having an upper surface intended to be mounted at the ceiling of a room or other appropriate area to be monitored and a housing enclosing the smoke... | 05/24/1983 |
