Fred C Sittler, Cynthia R Nelson: Micromachined valve with polyimide film diaphragm. Rosemount, Kinney & Lange P A, September 26, 1989: US04869282 (119 worldwide citation)

A micromachined miniature valve used for gas chromatography has very low valve and interconnection dimensions to reduce the fluid volume inherent in other gas switching valves to thereby provide accurate measurements involving small gas flows. In order to reduce actuating diaphragm size, without enc ...

Walter R Fehr, Earl G Hammond: Soybeans having low linolenic acid content and method of production. Iowa State University Research Foundation, Burns Doane Swecker & Mathis, July 9, 1996: US05534425 (96 worldwide citation)

Methods are described for the production of soybean varieties and lines exhibiting linolenic acid contents of less than about 2.5% of the total fatty acid composition as determined by gas chromatography, preferably less than about 2.2% and, more preferably, less than about 1.9%, and in one aspect of ...

Bernd J Meyer, Jeffrey P Sellers, Jan U Thomsen: Neural network system and methods for analysis of organic materials and structures using spectral data. University of Georgia Research Foundation, Kilpatrick & Cody, June 8, 1993: US05218529 (92 worldwide citation)

Apparatus and processes for recognizing and identifying materials. Characteristic spectra are obtained for the materials via spectroscopy techniques including nuclear magnetic resonance spectroscopy, infrared absorption analysis, x-ray analysis, mass spectroscopy and gas chromatography. Desired port ...

John M Hayes: Isotope-ratio-monitoring gas chromatography-mass spectrometry apparatus and method. Indiana University Foundation, Kirkland & Ellis, April 30, 1991: US05012052 (79 worldwide citation)

An isotope-ratio-monitoring gas chromatography-mass spectrometry apparatus and method are disclosed which provide for on-line analysis of isotope compositions with high precision. With the apparatus and method, samples are introduced in a hydrogen carrier gas into a gas chromatograph and resolved in ...

Michel G Goedert: Miniature devices useful for gas chromatography. The Perkin Elmer Corporation, H S Ingham, E T Grimes, June 19, 1990: US04935040 (64 worldwide citation)

Laminated wafers with channels formed therein define a plurality of gas chromatographic columns in a body, with substantially minimal connecting channels between an injector and a detector. One or more of the columns at a time is selected by valve to be receptive of sample gas. Detector and injector ...

Frank J Yang: Narrow bore micro-particulate column packing process and product. Varian Associates, Stanley Z Cole, Keiichi Nishimura, Norman E Reitz, November 20, 1984: US04483773 (56 worldwide citation)

A process for packing narrow bore chromatographic columns and the resulting product are provided. A flexible column, preferably of fused silica, of inner diameter less than 500 .mu.m is selected. A slurry is formed in a reservoir from a mobile solvent and particles of specified diameter. For liquid ...

Roger W Giese: Molecular analytical release tags and their use in chemical analysis. Northeastern University, Weingarten Schurgin Gagnebin & Hayes, November 24, 1987: US04709016 (53 worldwide citation)

A new class of chemical reagents called release tags which comprise signal, release and reactivity groups is disclosed and a release tag involving a pentafluorobenzoyl signal group, a methionylamide release group, and an active ester reactivity group is used to analyze the hormone, thyroxine, in ser ...

Walter G Jennings: Nonreactive inlet splitter for gas chromatography and method. The Regents of the University of California, Flehr Hohbach Test Albritton & Herbert, July 12, 1977: US04035168 (50 worldwide citation)

An inlet splitter apparatus and method for introducing substantially unreacted linear aliquots of vaporized sample and carrier gas to the capillary column of a capillary gas chromatograph. An elongate body with separate but axially aligned injector and mixing chambers, an inert (glass) tubular liner ...

James A Genovese, Charles S Harden, A Peter Snyder: Automated, on-demand ion mobility spectrometry analysis of gas chromatograph effluents. The United States of America represented by the Secretary of the Army, Edward L Stolarun, Ulysses John Biffoni, September 22, 1998: US05811059 (49 worldwide citation)

A chemical sampling apparatus including an interface between a miniature mobility spectrometer and a gas chromatography system. The apparatus has a gas chromatography an ion mobility spectrometer and an input for inputting a regulated flow of a gas to be analyzed to the gas chromatograph. An interfa ...

John H Jerman, Stephen C Terry: Gas chromatography system and detector and method. Board of Regents of Stanford University, Flehr Hohbach Test Albritton & Herbert, September 18, 1984: US04471647 (47 worldwide citation)

There is described a gas chromatographic assembly formed on a semiconductor wafer by etching techniques. There is also described an improved thermal detector for use therewith.

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