21
Teruo Katayose, Hiroji Oda: Polyphenylene ether resin comprising chloroform extractable/nonextractable polyphenylene ether resin. Asahi Kasei Kogyo Kabushiki Kaisha, Armstrong Nikaido Marmelstein Kubovcik & Murray, May 8, 1990: US04923932 (37 worldwide citation)

A novel cured polyphenylene ether resin is disclosed comprising a chloroform nonextractable polyphenylene ether and a chloroform extractable polyphenylene ether. By subjecting the resin to pyrolysis gas chromatography, the resin is decomposed to form 3,5-dimethylphenol specifically. The chloroform e ...


22
Wayne A Rubey: Gas chromatography methods and apparatus. University of Dayton, Biebel French & Nauman, May 8, 1990: US04923486 (33 worldwide citation)

Gas chromatographic methods and apparatus are disclosed whereby improved separation times and efficiency are achieved by provision of a time-programmable curvilinearly-shaped negative temperature gradient along the length of the chromatographic column. The gas phase sample traveling through the colu ...


23
Norman D Malcosky, Gregory Koziar: Gas tracer composition and method. Columbia Gas System Service, Sidney W Millard, September 1, 1987: US04690689 (33 worldwide citation)

The invention provides a method for tagging methane by adding thereto one or more of the tracer compounds sulfur hexafluoride and chloropentafluoroethane. The methane being tagged is normally being stored in underground storage fields to provide identity and proof of ownership of the gas. The two tr ...


24
Ravi Srinivasan, Daniel Meron Pinkas, Shenheng Guan, Michael Myslovaty, Michael Spitkovsky, James R Engstrom, H Sam Bergh: Parallel gas chromatograph with microdetector array. Symyx Technologies, Senniger Powers Leavitt & Roedel, March 9, 2004: US06701774 (33 worldwide citation)

Gas chromatographs of the invention generally comprise four or more analysis channels. Specifically, four or more gas chromatography columns are configured for parallel analysis of four or more gaseous samples with detection being effected using a microdetector array comprising four or more microdet ...


25
Hans Joachim Deutscher, Herrmann Schubert, Christina Seidel, Dietrich Demus, Horst Kresse: Liquid crystal compounds. VEB Werk fur Fernsehelektronik Berlin im VEB Kombinat Mikroelektronik, Michael J Striker, October 6, 1981: US04293434 (33 worldwide citation)

The invention describes nematic compositions for electrooptical devices for modulation of the transmitted or incident light and for the rendition of numbers, symbols and images as orientation in the spectroscopy and gas chromatography. The compositions comprise, liquid crystalline compounds such as ...


26
Wayne A Rubey: Gas chromatography methods and apparatus. University of Dayton, Killworth Gottman Hagan & Schaeff, July 2, 1991: US05028243 (32 worldwide citation)

Gas chromatographic methods and apparatus are disclosed whereby improved separation times and efficiency are achieved by provision of a rapid transfer of heat or cooling from a heating or cooling source to the chromatographic column. The column is provided within an insulating sheath. A resistance h ...


27
Wei Cheng Tian, Stella W Pang, Edward T Zellers: Microelectromechanical heating apparatus and fluid preconcentrator device utilizing same. The Regents of the University of Michigan, Brooks Kushman P C, July 5, 2005: US06914220 (32 worldwide citation)

A microelectromechanical heating apparatus and fluid preconcentrator device utilizing same wherein heating elements of the apparatus are sized and spaced to substantially uniformly heat a heating chamber within a heater of the apparatus. Tall, thermally-isolated heating elements are fabricated in Si ...


28
Wolfgang Chlosta, Wolfgang Riegger: Electric heater for a rotating sample vessel container in a sampling device for gas chromatography. Bodenseewerk Perkin Elmer & Co, E T Grimes, F L Masselle, J D Crane, November 19, 1985: US04554436 (32 worldwide citation)

A sample vessel container in a sampling device for use in gas chromatography includes a rotatable metal block having a circular array of axial bores for accommodating a plurality of sample vessels. A heating jacket operative as an electric heater is non-rotatably connected to a housing, which jacket ...


29
Stephen E O Brien, David H Fine, Freemand W Fraim: Detection method for checking surfaces for nitrogen-containing explosives or drugs. Thermedics, Darby & Darby, December 19, 1995: US05476794 (32 worldwide citation)

Disclosed is a method of rapidly checking surfaces for the presence of traces of specific compounds such as certain explosives and drugs. A hand-covering such as a cotton glove is used to wipe surfaces to pick up particles of the specific compound which may indicate the presence of larger amounts or ...


30
Terry J Nestrick, Rudolph H Stehl: Chromatographic column packing having a bonded organosiloxane coating. The Dow Chemical Company, Burke M Halldorson, December 30, 1980: US04242227 (32 worldwide citation)

Improved packings for columns useful in gas chromatography are made by a multistep process whereby polysiloxane molecules having various organic substituents are chemically bonded to the surface of a siliceous support. The process comprises one or more cycles of successive reactions with an activate ...



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