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Class Information
Number: 250/381
Name: Radiant energy > Invisible radiant energy responsive electric signalling > Including a radiant energy responsive gas discharge device > With means to supply the gas > With radioactive source
Description: Subject matter in combination with means to ionize the gas between the electrodes comprising a material that emits, spontaneously nuclear particulate or electromagnetic energy.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 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 |
| 6717153 |
Apparatus and methods for monitoring emissions |
Apr. 6, 2004 |
| 6292105 |
Thermal ionization detector |
Sep. 18, 2001 |
| 6153884 |
Radioisotope proximity sensor |
Nov. 28, 2000 |
| 6057774 |
Smoke alarm with anti-dust screen |
May. 2, 2000 |
| 5920072 |
Ionization detector |
Jul. 6, 1999 |
| 5879947 |
Apparatus and method for detecting DMAH using particle sensing detector |
Mar. 9, 1999 |
| 5856784 |
Low profile ionization chamber |
Jan. 5, 1999 |
| 5804828 |
Method and apparatus for optimizing the sensitivity and linearity of an electron capture detector |
Sep. 8, 1998 |
| 5633501 |
Combination photoelectric and ionization smoke detector |
May. 27, 1997 |
| 5485144 |
Compensated ionization sensor |
Jan. 16, 1996 |
| 5399864 |
Ionization type smoke detector |
Mar. 21, 1995 |
| 5347139 |
Dual energy tracer quantitative analysis |
Sep. 13, 1994 |
| 5317159 |
Method of using an electron capture type detector |
May. 31, 1994 |
| 5243330 |
Fire detector system and method |
Sep. 7, 1993 |
| 5237281 |
Ion drag air flow meter |
Aug. 17, 1993 |
| 5212470 |
Supervised fire alarm system |
May. 18, 1993 |
| 5160916 |
Ionization type smoke sensor |
Nov. 3, 1992 |
| 4868546 |
Radon detector |
Sep. 19, 1989 |
| 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 |
| 4761557 |
Ionization-type smoke detector |
Aug. 2, 1988 |
| 4755682 |
Ionization monitor with improved ultra-high megohm resistor |
Jul. 5, 1988 |
| 4740703 |
Ionization-type smoke detector |
Apr. 26, 1988 |
| 4705947 |
Pulsed helium ionization detection system |
Nov. 10, 1987 |
| 4704536 |
Gas sensor and gas detecting method |
Nov. 3, 1987 |
| 4684807 |
Flow contoured electron capture detector cell |
Aug. 4, 1987 |
| 4667106 |
Fire identification and discrimination method and apparatus |
May. 19, 1987 |
| 4651008 |
Sample inlet system for an electron capture detector |
Mar. 17, 1987 |
| 4631412 |
Ionization smoke detector |
Dec. 23, 1986 |
| 4618777 |
Outer electrode with improved smoke entry |
Oct. 21, 1986 |
| 4600314 |
Smoke detector cutoff timer |
Jul. 15, 1986 |
| 4564762 |
Smoke detector |
Jan. 14, 1986 |
| 4513202 |
Self compensating fire detection device |
Apr. 23, 1985 |
| 4488044 |
Ionization chamber for smoke detector and the like |
Dec. 11, 1984 |
| 4471346 |
Smoke detector |
Sep. 11, 1984 |
| 4469953 |
Combination ionization and photoelectric smoke detector |
Sep. 4, 1984 |
| 4456907 |
Ionization type smoke detector with test circuit |
Jun. 26, 1984 |
| 4455553 |
Smoke detector of the ionization type |
Jun. 19, 1984 |
| 4445038 |
Apparatus for simultaneous detection of positive and negative ions in ion mobility spectrometry |
Apr. 24, 1984 |
| 4439683 |
Ionization smoke detector |
Mar. 27, 1984 |
| 4423411 |
Ionization type fire detector |
Dec. 27, 1983 |
| 4401979 |
Electrical controls for ionization smoke detector |
Aug. 30, 1983 |
| 4396840 |
Ionization type smoke sensing device |
Aug. 2, 1983 |
| 4383253 |
Ionization smoke detector |
May. 10, 1983 |
| 4379290 |
Alarm device with a condition sensor element |
Apr. 5, 1983 |
| 4364031 |
Ionization smoke detector with increased operational reliability |
Dec. 14, 1982 |
| 4362941 |
Apparatus and a method for detecting and measuring trace gases in air or other gaseous background |
Dec. 7, 1982 |
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