31
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 ...


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
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 ...


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 (29 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 (29 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
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 (29 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 ...


37
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 ...


38
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 (28 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 ...


39
James S Fullemann: Injection septum with dust wiper. Merlin Instrument Company, Anderson & Hirsch, July 2, 1996: US05531810 (28 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 ...


40
Richard D Sacks, Christine L Rankin: Thermal modulation inlet for gas chromatography system. The Regents of the University of Michigan, Harness Dickey & Pierce, August 25, 1992: US05141532 (27 worldwide citation)

A gas chromatography system which incorporates a simplified sample injection system in which replaces conventional mechanical injection systems with one based strictly upon thermal trapping of a continuously supplied carrier gas and sample stream. The carrier gas and sample stream pass continuously ...



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