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Class Information
Number: 324/459
Name: Electricity: measuring and testing > Using ionization effects
Description: Subject matter wherein a medium is ionized and the ionized medium is used to measure or monitor a property or condition distinct from the cause of the ionization.

Sub-classes under this class:

Class Number Class Name Patents
324/464 For analysis of gas, vapor, or particles of matter 309
324/460 For monitoring pressure 93

Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8710849 Particle measurement process and apparatus Apr. 29, 2014
8653807 Apparatus and method for measuring ion beam current Feb. 18, 2014
8638106 Microdischarge-based pressure sensor and method Jan. 28, 2014
8614581 Vacuum ionization gauge Dec. 24, 2013
8563945 Sampling of confined spaces Oct. 22, 2013
8490598 Ignition coil with ionization and digital feedback for an internal combustion engine Jul. 23, 2013
8461844 Self charging ion sensing coil Jun. 11, 2013
8358137 Method and apparatus for examining ion-conductive electrolyte membrane Jan. 22, 2013
8350572 Ionization vacuum device Jan. 8, 2013
8242783 Ionization vacuum gauge Aug. 14, 2012
8169223 Ionization vacuum gauge May. 1, 2012
8129978 Material detector Mar. 6, 2012
7990161 Apparatus for measuring total acid number of oil and estimating lifetime of oil, and method for measuring total acid number of oil and oil sensor using the same Aug. 2, 2011
7910377 Methods and apparatuses for preparing a surface to have catalytic activity Mar. 22, 2011
7825648 Substance identification and location method and system Nov. 2, 2010
7821270 Electrode contact pellet and associated photoionisation detector assembly Oct. 26, 2010
7791350 Ionization vacuum gauge Sep. 7, 2010
7756566 Magnetic resonance imaging for a plurality of selective regions set to object continuously moved Jul. 13, 2010
7656165 Method and apparatus for maintaining emission capabilities of hot cathodes in harsh environments Feb. 2, 2010
7609067 Electronic portion of an ion gauge with ion collectors bowed out of plane to form a three dimensional arrangement Oct. 27, 2009
7564246 Pressure sensor using field emission of carbon nano-tube Jul. 21, 2009
7456633 Apparatus for and method of measuring composition and pressure of the discharged gas from ion gauge using residual gas analyzer Nov. 25, 2008
7429863 Method and apparatus for maintaining emission capabilities of hot cathodes in harsh environments Sep. 30, 2008
7368917 Electronic circuit for ion sensor with body effect reduction May. 6, 2008
7309992 Gas analysis method and ionisation detector for carrying out said method Dec. 18, 2007
7183772 Ion detector Feb. 27, 2007
7046012 Ionization devices May. 16, 2006
6853195 Device and process for measurement of the concentration of ions in a measurement liquid Feb. 8, 2005
6831465 Electrical measurement means Dec. 14, 2004
6826489 Fault classification in a plasma process chamber Nov. 30, 2004
6781383 Method for fault detection in a plasma process Aug. 24, 2004
6771075 Air ion measuring device Aug. 3, 2004
6768311 Ion measuring device Jul. 27, 2004
6756785 Pressure controlled degas system for hot cathode ionization pressure gauges Jun. 29, 2004
6734677 Device and method for detecting engine combustion condition May. 11, 2004
6717413 Contact potential difference ionization detector Apr. 6, 2004
6583627 Process and apparatus for testing multi-layer composites and containers produced therefrom Jun. 24, 2003
6570389 Prevention of arcing in power supplies May. 27, 2003
6549013 Ionic current measuring glow plug and process and circuit for its activation Apr. 15, 2003
6545480 Method for carrying out the electrical breakdown of a gaseous dielectric in a highly non-uniform field Apr. 8, 2003
6531877 Miniaturized glow discharge electron capture detector Mar. 11, 2003
6515482 Ionization vacuum gauge Feb. 4, 2003
6462553 Device and method for converting a charge-flow into a frequency signal Oct. 8, 2002
6452401 Charged particle analysis Sep. 17, 2002
6452400 Method of measuring negative ion density of plasma and plasma processing method and apparatus for carrying out the same Sep. 17, 2002
6441620 Method for fault identification in a plasma process Aug. 27, 2002
6433553 Method and apparatus for eliminating displacement current from current measurements in a plasma processing system Aug. 13, 2002
6348799 Method for determining the ion component following a combustion process in a self-igniting internal combustion engine Feb. 19, 2002
6333632 Alternating current discharge ionization detector Dec. 25, 2001
6320388 Multiple channel photo-ionization detector for simultaneous and selective measurement of volatile organic compound Nov. 20, 2001

1 2 3

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