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
Brian D Ross, Peter B Kingsley: Isotope and assay for glycolysis and the pentose phosphate pathway. The Regents of the University of Michigan, Harness Dickey & Pierce, August 8, 1995: US05439803 (33 worldwide citation)

An isotopically substituted molecule D-(1,6-.sup.13 C.sub.2,6,6-.sup.2 H.sub.2)glucose and method of use is provided for measuring the relative activities of glycolysis and the pentose phosphate pathway (PPP). By using the isotope, labeled in the C1 and C6 positions, of the present invention, a sing ...


27
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 ...


28
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 ...


29
Raymond Annino, Edward L Lewis, Dale E Lueck, Matthew L Phillips, Richard Villalobos: Modular gas chromatography device. The Foxboro Company, Jules Jay Morris, James M Smith, August 23, 1994: US05340543 (32 worldwide citation)

A chromatography device for separating sample fluids from carrier fluids and analyzing the sample is configured so that it is a modular unit. This modularity enables repairs to be quickly effected on the unit and also greatly simplifies the task of accessing the components of the chromatography cart ...


30
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 ...



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