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Class Information
Number: 250/345
Name: Radiant energy > Invisible radiant energy responsive electric signalling > Infrared responsive > With means to transmission-test contained fluent material > Plural beam/detector pairs
Description: Subject matter wherein the source of infrared radiation forms two or more beams with at least one beam being transmitted through the contained material, and two or more electric signalling means, one responsive to radiation transmitted through the contained material and at least one in the path of one of the other beams.

Sub-classes under this class:

Class Number Class Name Patents
250/346 Plural temperature sensitive signalling means 28

Patents under this class:
1 2 3 4 5

Patent Number Title Of Patent Date Issued
8415626 Intrinsically safe NDIR gas sensor in a can Apr. 9, 2013
8222606 Air sampler for recalibration of absorption biased designed NDIR gas sensors Jul. 17, 2012
8217355 Self-commissioning NDIR gas sensors Jul. 10, 2012
8143581 Absorption biased NDIR gas sensing methodology Mar. 27, 2012
8097856 Super-miniaturized NDIR gas sensor Jan. 17, 2012
8018596 Interactive variable pathlength device Sep. 13, 2011
7957001 Wavelength-modulation spectroscopy method and apparatus Jun. 7, 2011
7736903 Tracer to compensate for environmental variations that influence a chemical vapor sensor measurement Jun. 15, 2010
7700044 Chemical vapor sensor Apr. 20, 2010
7679059 Measuring water vapor in hydrocarbons Mar. 16, 2010
7435964 Thermal sensor with increased sensitivity Oct. 14, 2008
7427501 System and method for optically monitoring the concentration of a gas, or the pressure, in a sample vial to detect sample growth Sep. 23, 2008
7345280 Measurement of steam quality using multiple broadband lasers Mar. 18, 2008
7244939 Gas sensor Jul. 17, 2007
7166842 Gas sensor arrangement with reduced settling time Jan. 23, 2007
6967322 Method and apparatus for performing rapid isotopic analysis via laser spectroscopy Nov. 22, 2005
6895269 Device for controlling equipment by using signals from a living body May. 17, 2005
6818895 Respiratory gas analyzer Nov. 16, 2004
6815681 Electron beam lithography apparatus using a patterned emitter Nov. 9, 2004
6791088 Infrared leak detector Sep. 14, 2004
6768126 Thermal image identification system Jul. 27, 2004
6762410 Analysis apparatus Jul. 13, 2004
6756591 Method and device for photothermal imaging tiny particles immersed in a given medium Jun. 29, 2004
6710873 Temperature-independent measurements of gas concentration Mar. 23, 2004
6694800 Gas analyzer using thermal detectors Feb. 24, 2004
6670613 System and method for spectral analysis Dec. 30, 2003
6661073 Semiconductor infrared detector and method for the production thereof Dec. 9, 2003
6635875 Infrared gas analyzer and method for operating said analyzer Oct. 21, 2003
6509567 Method and apparatus for detecting gases Jan. 21, 2003
6473705 System and method for direct non-intrusive measurement of corrected airflow Oct. 29, 2002
6469303 Non-dispersive infrared gas sensor Oct. 22, 2002
6442639 Docking station for environmental monitoring instruments Aug. 27, 2002
6369387 Gas analyzer Apr. 9, 2002
6277081 Anesthetic gas detection apparatus Aug. 21, 2001
6274870 Method for spectrometrically measuring isotopic gas and apparatus thereof Aug. 14, 2001
6191421 Gas analyzer using infrared radiation to determine the concentration of a target gas in a gaseous mixture Feb. 20, 2001
6166383 Non-dispersive infrared gas analyzer Dec. 26, 2000
6147351 Accurate measurement for the concentration of a gas component in a gas mixture, wherein other components influence the concentration analysis Nov. 14, 2000
6078049 Stable isotope analyzer Jun. 20, 2000
6064066 Bolometer autocalibration May. 16, 2000
6040914 Simple, low cost, laser absorption sensor system Mar. 21, 2000
6040915 Analysis method for gases and apparatus therefor Mar. 21, 2000
6037592 System for measuring gases dissolved in a liquid Mar. 14, 2000
5977546 Self normalizing radiant energy monitor and apparatus for gain independent material quantity measurements Nov. 2, 1999
5957858 Systems and methods for monitoring relative concentrations of different isotopic forms of a chemical species Sep. 28, 1999
5936250 Ultraviolet toxic gas point detector Aug. 10, 1999
5903006 Liquid concentration detecting apparatus May. 11, 1999
5900635 Correction of collision broadening in non-dispersive absorption measurement of gases May. 4, 1999
5813767 System and a method for monitoring combustion and pollutants in a thermal plant by means of laser diodes Sep. 29, 1998
5801384 Infrared gas spectrometer having sealed sections for improved safety Sep. 1, 1998

1 2 3 4 5

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