51
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 ...


52
Richard Sacks, Christine Rankin, Mark Klemp: Gas chromatography system and methods. The Regents of the University of Michigan, Harness Dickey & Pierce, March 17, 1992: US05096471 (25 worldwide citation)

Gas chromatography apparatus and procedures are described which enables gas chromatography to be carried out more rapidly than in accordance with prior art techniques and further enables chromatogram peaks caused by materials of interest from being obscured due to their super imposition upon high pe ...


53
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 ...


54
James P Conkle, William W Lackey, Charles L Martin: Sorption tube atmospheric sampling system. The United States of America represented by the Secretary of the Air Force, Joseph E Rusz, Jacob N Erlich, October 16, 1979: US04170901 (25 worldwide citation)

A sorption tube atmospheric sampling system having a sorption tube, a vacuum pump and a flow meter. The sorption tube is made of a hollow elongated tubular-shaped element of rigid, non-corrosive material having a pair of mesh filters located at each end thereof and the sorbent material located there ...


55
Frank J Yang, John V Hinshaw Jr: Solute focusing technique for on-column injection in capillary gas chromatography. Varian Associates, Stanley Z Cole, Keiichi Nishimura, October 16, 1984: US04477266 (25 worldwide citation)

A solute focusing method is applied to the on-column injection of a liquid sample in gas chromatography so that relatively large sample sizes can be used without causing intolerable column flooding. The injection zone of the column is kept originally at a temperature below the solvent boiling point ...


56
Timothy J Gardner, Ronald P Manginelli, Patrick R Lewis, Gregory C Frye Mason, Chris Colburn: Microcombustor. Sandia Corporation, Kevin W Bieg, September 7, 2004: US06786716 (25 worldwide citation)

A microcombustor comprises a microhotplate and a catalyst for sustained combustion on the microscale. The microhotplate has very low heat capacity and thermal conductivity that mitigate large heat losses arising from large surface-to-volume ratios typical of the microdomain. The heated catalyst enab ...


57
John C Hu: Method for determining formulation and chemical structure of materials by improved pyrolysis gas chromatography. The Boeing Company, Christensen O Connor Johnson & Kindness, July 3, 1979: US04159894 (24 worldwide citation)

A material containing both volatile and nonvolatile components, such as a compounded high polymer, is analyzed using pyrolysis gas chromatography by directly inserting a sample into a sample injection chamber in contact with a flowing carrier gas stream upstream of a chromatographic column. Prior to ...


58
Junior E Sandoval, Joseph J Pesek: Silicon hydride surface intermediates for chemical separations apparatus. Majestic Parsons Siebert & Hsue, May 21, 1991: US05017540 (24 worldwide citation)

The present invention produces very stable, covalently bonded separation substrates for separations application such as liquid and gas chromatography as well as capillary zone electrophoresis. An intermediate substrate is prepared which has hydride species on the substrate surface. These hydrides pr ...


59
Jose F Manfredi, Jose E De Mendonca: Compact separating system with snap-in columns. Jose Felix Manfredi, Beveridge DeGrandi & Weilacher, April 21, 1992: US05105652 (24 worldwide citation)

A fluid separation system applicable to gas chromatography includes a separating column in the form of a coiled tube in a thermally insulated enclosure. The ends of the coiled tube are connected by snap-action couplings to the outlet of an injector and the inlet of a detector which generates an elec ...


60
Somenath Mitra: Microfabricated microconcentrator for sensors and gas chromatography. New Jersey Institute of Technology, Kaplan Gibman Gibson & Dernier, December 12, 2006: US07147695 (23 worldwide citation)

Devices for enhancing the sensitivity of a microsensor or any other micro device by providing on-line preconcentration. Microconcentrators that can be integrated with a sensor or a micromachined GC to enhance the signal to noise ratio can include a miniaturized sorbent trap fabricated on a microchip ...



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