31
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 ...


32
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 ...


33
Walter R Fehr, Earl G Hammond: Soybeans having low linolenic acid content and palmitic acid content of at least eleven percent. Iowa State University Research Foundation, Burns Doane Swecker & Mathis L, June 9, 1998: US05763745 (31 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 ...


34
Michael R Strunk, William E Bechtold: Automated two-dimensional interface for capillary gas chromatography. Lovelace Biomedical & Environmental Research Institute, Roger F Phillips, February 20, 1996: US05492555 (30 worldwide citation)

A multidimensional gas chromatograph (GC) system having wide bore capillary and narrow bore capillary GC columns in series and having a novel system interface. Heart cuts from a high flow rate sample, separated by a wide bore GC column, are collected and directed to a narrow bore GC column with carr ...


35
Glenn M Thompson: System for continuously monitoring for leaks in underground storage tanks. Tracer Research Corporation, Harry M Weiss & Associates, December 1, 1987: US04709577 (30 worldwide citation)

An apparatus and method for detecting leaks from underground gasoline storage tanks and the like by routine or periodic soil samples tested for a particular tracer. A fluorinated halocarbon compound tracer having a boiling point less than that of gasoline is slowly dispensed within the gasoline, nat ...


36
Robert O Brien: Method and apparatus for concentrating samples for analysis. The State of Oregon Acting By and Through The State Board of Higher Education On Behalf of Portland State University, Klarquist Sparkman, October 11, 2005: US06952945 (29 worldwide citation)

A method for analyzing a gas sample is described. The method comprises providing a gas sample, increasing pressure applied to the gas sample to compress the sample to a smaller volume and provide a pneumatically focused gas sample, and analyzing the pneumatically focused gas sample using any of a va ...


37
Leonard H Nelms, Kenneth D Reiszner, Philip W West: Personal monitoring device, or dosimeter, for measuring exposure of personnel to organic vapors. Board of Supervisors Louisiana State University Agricultural and Mechanical College, L A Proctor, August 9, 1977: US04040805 (29 worldwide citation)

A personal monitoring device, dosimeter, or badge-like apparatus for measuring the exposure of personnel to pollutant toxic organic vaporous materials, notably vinyl chloride, comprised of a body portion provided with a relatively shallow top cavity, or cup-like member completely filled with an adso ...


38
James S Fullemann: Injection septum with dust wiper. Merlin Instrument Company, Anderson & Hirsch, July 2, 1996: US05531810 (29 worldwide citation)

A cap assembly for a gas chromatography injection port includes a two-piece septum. The two-piece septum includes a syringe seal for sealing an injection needle and a duckbill seal for sealing the injection port when the needle is not inserted. The syringe seal includes three annular ribs in its ape ...


39
Richard L Scott: Predetector reservoir for chromatographic analysis instrument. Phillips Petroleum Company, August 21, 1984: US04467038 (28 worldwide citation)

A gas chromatographic apparatus is provided which comprises a gas chromatography column, a detector and an extended conduit between the column and the detector, the conduit providing means for flow of a gas so as to enable essentially complete elution of the gas from the column before the gas is det ...


40
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 (27 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 ...



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