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Class Information
Number: 250/384
Name: Radiant energy > Invisible radiant energy responsive electric signalling > Including a radiant energy responsive gas discharge device > With means to ionize the gas > Radioactive
Description: Subject matter wherein the means to ionize the gas is a material that emits spontaneously, invisible nuclear particulate or electromagnetic energy.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7456411 |
He-3 neutron proportional counter with internal leakage detection and related method |
Nov. 25, 2008 |
| 7402800 |
Method and device for the continuous determination of damage to systems used for the post-treatment of heat engine exhaust gases |
Jul. 22, 2008 |
| 6953936 |
Ionization type smoke sensing chamber |
Oct. 11, 2005 |
| 6606899 |
Total impurity monitor for gases |
Aug. 19, 2003 |
| 6567346 |
Absolute time scale clock |
May. 20, 2003 |
| 6365902 |
Radiation detector, an apparatus for use in radiography and a method for detecting ionizing radiation |
Apr. 2, 2002 |
| 6362743 |
Smoke alarm with dual sensing technologies and dual power sources |
Mar. 26, 2002 |
| 6320388 |
Multiple channel photo-ionization detector for simultaneous and selective measurement of volatile organic compound |
Nov. 20, 2001 |
| 6320261 |
High aspect ratio metallization structures for shallow junction devices, and methods of forming the same |
Nov. 20, 2001 |
| 6288400 |
Portable apparatus for the measurement of environmental radon and thoron |
Sep. 11, 2001 |
| 6107805 |
Extended detection zone in an ionization detector |
Aug. 22, 2000 |
| 5920072 |
Ionization detector |
Jul. 6, 1999 |
| 5679958 |
Beta particle monitor for surfaces |
Oct. 21, 1997 |
| 5633501 |
Combination photoelectric and ionization smoke detector |
May. 27, 1997 |
| 5400013 |
Ionization type smoke detector |
Mar. 21, 1995 |
| 5399864 |
Ionization type smoke detector |
Mar. 21, 1995 |
| 5237281 |
Ion drag air flow meter |
Aug. 17, 1993 |
| 5223712 |
Closed loop ionization apparatus for detecting trace gases |
Jun. 29, 1993 |
| 5184019 |
Long range alpha particle detector |
Feb. 2, 1993 |
| 5180917 |
Self-calibrating proportional counter |
Jan. 19, 1993 |
| 5153520 |
Identifying and quantifying the presence of alpha radiation and specific gaseous molecules present in air samples |
Oct. 6, 1992 |
| 4864141 |
Smoke detector with ionization chamber |
Sep. 5, 1989 |
| 4853544 |
Heat-resistant case for an ionization-type smoke detector and method of making the same |
Aug. 1, 1989 |
| 4845474 |
Smoke and fire detector |
Jul. 4, 1989 |
| 4786811 |
Ionization type-smoke detector |
Nov. 22, 1988 |
| 4761557 |
Ionization-type smoke detector |
Aug. 2, 1988 |
| 4705947 |
Pulsed helium ionization detection system |
Nov. 10, 1987 |
| 4704536 |
Gas sensor and gas detecting method |
Nov. 3, 1987 |
| 4618777 |
Outer electrode with improved smoke entry |
Oct. 21, 1986 |
| 4595914 |
Self-testing combustion products detector |
Jun. 17, 1986 |
| 4594512 |
Ionization type smoke detector |
Jun. 10, 1986 |
| 4567368 |
Bipolar pulsed electron capture detectors |
Jan. 28, 1986 |
| 4524351 |
Smoke detector |
Jun. 18, 1985 |
| 4511889 |
Surge protected smoke alarm |
Apr. 16, 1985 |
| 4475390 |
Smoke detector |
Oct. 9, 1984 |
| 4450409 |
Pressure sensor and leak detector |
May. 22, 1984 |
| 4401979 |
Electrical controls for ionization smoke detector |
Aug. 30, 1983 |
| 4384488 |
Smoke detector |
May. 24, 1983 |
| 4328424 |
Ionization detector chamber |
May. 4, 1982 |
| 4308458 |
Fire detectors utilizing an ionization chamber not subject to condensation of water vapor during variations of temperature |
Dec. 29, 1981 |
| 4245174 |
Dual ionization chamber |
Jan. 13, 1981 |
| 4238678 |
Apparatus and a method for detecting and measuring trace gases in air or other gaseous backgrounds |
Dec. 9, 1980 |
| 4227085 |
Ionization-type particle detector |
Oct. 7, 1980 |
| 4220862 |
Ionization chamber for a smoke detector having an improved arrangement for capturing airborne combustion products |
Sep. 2, 1980 |
| 4160908 |
Particulate enhancement for generator condition monitors |
Jul. 10, 1979 |
| 4137453 |
Methods and apparatus for improving electron capture detectors by collection of ions |
Jan. 30, 1979 |
| 4119851 |
Apparatus and a method for detecting and measuring trace gases in air or other gas backgrounds |
Oct. 10, 1978 |
| 4101278 |
Ionization detector utilizing tritiated scandium with an acceptable tritium emanation rate at high temperature |
Jul. 18, 1978 |
| 4080535 |
Generator condition monitor for particulate detection |
Mar. 21, 1978 |
| 4074137 |
Heated ion chamber detector for a dynamoelectric machine |
Feb. 14, 1978 |
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