41
David P Rounbehler, Eugenie Hainsworth, David P Lieb: Selective detection with high speed gas chromatography. Thermedics, Herbert E Messenger, May 10, 1994: US05310681 (27 worldwide citation)

A highly selective, sensitive, fast detection system and method are disclosed for detecting vapors of specific compounds in air. Vapors emanating from compounds such as explosives, or stripped from surfaces using heat and suction from a hand-held sample gun, are collected on surfaces coated with gas ...


42
W Barry Baker, Harry E Betsill: Pump unit for sampling air. E I Du Pont de Nemours and Company, Hilmar L Fricke, July 9, 1985: US04527953 (27 worldwide citation)

An improved pump unit for sampling air that operates at a constant air flow rate in the range of 5-5000 cc/min. having a filter for removing particles or vapors from the air stream, an air accumulator, a variable drive pump optionally with a bypass, an electric motor for driving the pump, an optiona ...


43
David P Rounbehler, David P Lieb, Eugene K Achter, David B Gernes, Abdul Tafreshi: Vapor detection with high speed gas chromatography. Thermedics, Herbert E Messenger, April 28, 1992: US05108705 (26 worldwide citation)

Disclosed are a method and apparatus for high speed, selective detection of vapors of specific compounds, particularly nitrogen-containing compounds, utilizing, a bypass branch and high speed gas chromatography for improved selectively and sensitivity of detection. A system with two gas chromatograp ...


44
Braman Robert S, Dynako Alexander: Method and apparatus for gas analysis utilizing a direct current discharge. IIT Research Institute, October 12, 1971: US3612686 (26 worldwide citation)

A method and apparatus for spectrochemical analysis of a gas is provided in which the subject gas is mixed with a carrier gas and introduced into an analysis space between two electrodes. A continuous direct current discharge between the electrodes is produced which sustains a plasma formed from the ...


45
Stephen R Springston: Method for making a non-extractable stationary phase of polymer within a capillary column. Associated Universities, Vale P Myles, October 30, 1990: US04966785 (26 worldwide citation)

A method for coating interior capillary column surfaces, or packing material of a packed column, used for gas chromatography, with a stationary polymer phase that is cross-linked by exposing it to a low-temperature plasma that is uniformly distributed over the column or packing material for a predet ...


46
Ronald P Manginell, Gregory C Frye Mason: Temperature programmable microfabricated gas chromatography column. Sandia Corporation, Kevin W Bieg, December 23, 2003: US06666907 (26 worldwide citation)

A temperature programmable microfabricated gas chromatography column enables more efficient chemical separation of chemical analytes in a gas mixture by the integration of a resistive heating element and temperature sensing on the microfabricated column. Additionally, means are provided to thermally ...


47
Anita J Peters, Richard D Sacks: Adsorbent trap for gas chromatography. The Regents of the University of Michigan, Harness Dickey & Pierce, February 22, 1994: US05288310 (25 worldwide citation)

A gas chromatography system in which prefocusing of a sample analyte is provided through the use of an adsorbent coated porous layer open tubular trap tube. Through the use of an adsorbent coated collection device low boiling point components can be successfully trapped for preconcentration and inje ...


48
Richard D Sacks, Anita J Peters: Mechanical gas chromatography injection valves and column multiplexing techniques. The Regents of the University of Michigan, Harness Dickey & Pierce, April 27, 1993: US05205845 (25 worldwide citation)

Several embodiments of gas chromatography systems are disclosed incorporating mechanical sample injection valves. The injection valves incorporate a delivery tube having an outlet which is swept past the inlet of a separation column to provide a short duration inlet plug into the separation column. ...


49
J Fred Kolhouse, John C Deutsch, Vincent Guay, James P Ounsworth: Non-invasive evaluation of maldigestion and malaborption. Greenlee and Winner, April 9, 1996: US05506147 (25 worldwide citation)

A bentiromide test for evaluation of pancreatic function is provided which includes the steps of administering a stable, non-radioactive isotope of PABA along with the bentiromide and measuring the natural PABA and PABA isotope by gas chromatography mass spectroscopy (GC/MS). In a preferred embodime ...


50
Adams Gary Eugene: Light-pipe assembly for spectroscopy.. Ibm, July 16, 1986: EP0187306-A2 (25 worldwide citation)

A gas chromatography (GC) infra-red (IR) system for analyzing the constituents of a gas sample uses a floating light pipe assembly which is disposed in a bore and troughs of a heater chamber (30) in a heater assembly. The floating light pipe assembly has two transfer tubes (26,28) and a light pipe t ...



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