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| Number | Title | Issue Date |
| 8021468 | Room temperature chemical trap for the purification of gaseous methane A room temperature trap for the purification and concentration of gaseous methane. The trap utilizes the adsorption and desorption properties of microporous spherical carbon molecular sieves to purify and concentrate radiolabelled methane for application in an autom... | 09/20/2011 |
| 7361208 | Chromatography oven with heat exchange and method of use Methods and systems for cooling gas chromatography ovens that comprise a housing having a fluid entry and a sleeve positioned within the housing to provide a fluid gap between the inner surface of the housing and the outer surface of the sleeve, where the sleeve is ... | 04/22/2008 |
| 7135056 | Method and system for sub-ambient pressure control for column head pressure in gas chromatography systems Methods and system for sub-ambient pressure control for column head pressure in gas chromatography (GC) systems. The GC system includes an inlet and a capillary column connected to the inlet. The inlet includes a valve that regulates an inlet pressure and pressure s... | 11/14/2006 |
| 7121276 | Personal oxygen concentrator An oxygen separator for separating oxygen from ambient air utilizing a vacuum swing adsorption process has a mass of less than 2.3 kg. A carrier is mountable on a person to support the oxygen separator for ambulatory use. ... | 10/17/2006 |
| 7091044 | Partial modulation via pulsed flow modulator for comprehensive two-dimensional liquid or gas chromatography This invention is a method and device for use with multi-dimensional chromatography that utilizes partial modulation. An analyte-bearing sample is subjected to a first dimension of chromatography. Thereafter the separated analyte-bearing sample is diluted with a mod... | 08/15/2006 |
| 7052914 | Automated method for examining catalytic and spectroscopic properties of the components of combinatorial libraries The invention relates to an automated method for carrying out reactions with high spatial resolution on libraries of different materials and for analysis of the products obtained using a simple robot system and an analyzer, for example a mass spectrometer. ... | 05/30/2006 |
| 6838288 | Modulator for gas chromatography This invention relates to a modulator for use in gas chromatographic analysis, adopted for alternatively trapping and releasing fractions of solutes in a length of a capillary column within a chromatographic oven, characterized in that it comprises at least one nozz... | 01/04/2005 |
| 6706535 | Pulsed carrier gas flow modulation for selectivity enhancements with gas chromatography using series-coupled column ensembles A gas chromatography system having a computer-controlled venting valve system that delivers pressurized pulses to a column junction point of two series-coupled columns having different stationary-phase chemistries and a method of using the same. Each pressurized pul... | 03/16/2004 |
| 6706534 | Pulsed carrier gas flow modulation for selectivity enhancements with gas chroma tography using series-coupled ensembles A gas chromatography system having a computer-controlled pressure controller that delivers pressurized pulses to a column junction point of two series-coupled columns having different stationary-phase chemistries and a method of using the same. Each pressurized puls... | 03/16/2004 |
| 6702989 | Pulsed carrier gas flow modulation for selectivity enhancements with gas chromatography using series-coupled column ensembles A gas chromatography system having a computer-controlled venting valve system that delivers pressurized pulses to a column junction point of two series-coupled columns having different stationary-phase chemistries and a method of using the same. Each pres... | 03/09/2004 |
| 6649129 | Method and apparatus for concentrating a VOC sample A system for concentrating a volatile organic compound (VOC) sample uses in one embodiment a bypass line and a valve coupled thereto to regulate an amount of carrier gas flowing through a carrier gas line. A flow splitter fluidly couples the bypass line t... | 11/18/2003 |
| 6402947 | Interphase device for the direct coupling of liquid chromatography and gas chromatography The basic structure of a PTV (programmed temperature vaporizer) injector has been considerably modified so that is can be used for the direct coupling of liquid chromatography in normal phase or reverse phase, and gas chromatography and also for the intro... | 06/11/2002 |
| 6312575 | Methods and devices for chromatographic pattern analysis employing chromatographic variability characterizations Method and devices for performing chromatographic pattern analysis determine chromatographic variability due to a plurality of sources without requiring identification or characterization of peaks or other chromatographic features, receives data indicativ... | 11/06/2001 |
| 6311544 | Selective removal of volatile substances injected into a chromatographic packing filled column A flow of a carrier gas through a column is provided. A sample is provided in the column, and a temperature of a longitudinally short portion of the column is raised to a predetermined controlled high temperature at which volatile substances are released ... | 11/06/2001 |
| 6210465 | Method for identification of components within a known sample A method for identifying components within a known type of sample through pattern recognition between an array of recognition coefficients generated from the attributes and stable relationships of a plurality of peaks within a chromatogram of a sample to ... | 04/03/2001 |
| 6190613 | Sample concentration device A sample concentration device is provided in which a gaseous sample is concentrated by cooling a portion of a gas transfer line through which the sample is introduced into a detecting apparatus, such as a gas chromatograph or the like. The device is chara... | 02/20/2001 |
| 6131440 | Selective removal of volatile substances injected into a chromatographic packing filled column A flow of a carrier gas through a column is provided. A sample is provided in the column, and a temperature of a longitudinally short portion of the column is raised to a predetermined controlled high temperature at which volatile substances are released ... | 10/17/2000 |
| 6106782 | Chromatograph A chromatograph is provided for accurately identifying components of a sample even with the use of a moving average method for noise reduction. A eluding solution is supplied to a column by a pump. In a sample injector, the sample injected into the column... | 08/22/2000 |
| 6074461 | Chromatograph having a gas recycling system A chromatograph includes an inlet for receiving a sample and a pressurized carrier fluid flow and in response providing a sample/fluid mixture; a separation column located in a temperature-controlled zone for receiving the sample/fluid mixture and for pro... | 06/13/2000 |
| 5944877 | Precolumn separator for gas chromatograph A precolumn separator provides a method of separating a solvent from a sample for use in a gas chromatograph. The precolumn has an independent carrier gas control mechanism which allows the carrier gas to be passed through the preseparation column at a ra... | 08/31/1999 |
| 5929321 | Selective removal of volatile substances injected into a chromatographic packing filled column A flow of a carrier gas through a column is provided. A sample is provided in the column, and a temperature of a longitudinally short portion of the column is raised to a predetermined controlled high temperature at which volatile substances are released ... | 07/27/1999 |
| 5782964 | Gas chromatography column assembly temperature control system A temperature control system (10) is provided for controlling temperature parameters in a gas chromatography column assembly (18). The temperature control system (10) includes an extended length capillary gas chromatography column member (12) which contai... | 07/21/1998 |
| 5711786 | Gas chromatographic system with controlled sample transfer In a gas chromatographic system that includes a column and an injector with a chamber, a carrier gas normally flows into the chamber at a constant rate, and a constant primary pressure is maintained at the column inlet. A sampling receptacle selectively c... | 01/27/1998 |
| 5670379 | Chromatograph system and method of use A chromatograph system with improved automation is provided. In the chromatograph system of one embodiment, a regression line is set between retention times of predetermined peaks measured at each run in the past for a standard sample having known compone... | 09/23/1997 |
| 5588988 | Thermal desorption device for a gas chromatograph The invention relates to a thermal desorption device for a gas chromatograph, having a thermostatically controlled oven (1) provided with a carrier gas connection and having an evaporator tube. In this case, the evaporator tube is an interchangeable sampl... | 12/31/1996 |
| 5567227 | Method for improving the range of stable control of the pneumatic system of a gas chromatograph A frequency response of a pneumatic system used to control a gas chromatograph may be determined by applying a loop-closed direct method. The loop-closed direct method can be used to describe a frequency response of a time-invariant, linear system and pre... | 10/22/1996 |
| 5545252 | Flow regulation in gas chromatograph A gas chromatographic system includes a column and an injector for delivering into the column a test portion of flow. The injector has an exit passage for discharging a split portion of carrier flow. A flow controller for regulating the inlet flow rate in... | 08/13/1996 |
| 5508204 | Multiple sample sequential chemical analysis A method for analyzing multiple analyte specimens using an analytical column containing a selective adsorbent media. A carrier fluid flows through the column. The method involves introducing a first analyte specimen into the analytical column at an initia... | 04/16/1996 |
| 5436166 | Method of and apparatus for performing chromatography analysis of unknown sample The present invention relates to a chromatography analysis method and a system employing the same which are capable of automatically determining an constituents to be detected contained in the unknown sample based on results on measuring a standard sample... | 07/25/1995 |
| 5431712 | Reconfigurable pneumatic control for split/splitless injection Chromatographic system includes a split/splitless injection port operatively connected to an inlet line for receiving the regulated carrier gas flow, a separation column for receiving at least a portion of the mixture as a column flow, and a split vent li... | 07/11/1995 |
| 5395521 | Automated column equilibration, column loading, column washing and column elution Method and apparatus for automatic chromatographic column operations, including column equilibration, column loading, column washing, and column elution. A novel pipette tip column is shown which is packed with a binding material sandwiched between two pe... | 03/07/1995 |
| 5322626 | Decoupled flow and pressure setpoints in an extraction instrument using compressible fluids Methods and apparatus for extracting sample components from complex matrices using supercritical fluid as the principal extracting solvent are disclosed. The invention takes advantage of the fact that the solvent power of a supercritical fluid is stepwise... | 06/21/1994 |
| 5240603 | Decoupled flow and pressure setpoints in an extraction instrument using compressible fluids Methods and apparatus for extracting sample components from complex matrices using supercritical fluid as the principal extracting solvent are disclosed. The invention takes advantage of the fact that the solvent power of a supercritical fluid is stepwise... | 08/31/1993 |
| 4944781 | Gas chromatograph/autosampler coupling assembly An assembly for coupling a Hewlett-Packard Model HP 7673A autosampler mounted on a mounting plate to a Varian VISTA 6000 Model gas chromatograph having an injection site, includes a first bracket secured to the gas chromatograph on one side of the injecti... | 07/31/1990 |
| 4711764 | Automatic sample injector and disposable sample cassette An automatic sample injector for high pressure liquid chromatography, utilizing a cassette-like holder of a plurality of sample columns and an automatic injection unit which sequentially and successively advances the cassette and removes each sample there... | 12/08/1987 |
| 4711765 | Sorption/desorption gas analysis apparatus A sorption/desorption gas analysis apparatus includes a sorption/desorption bed having a thin layer of sorption material fixed to an outside surface of a first and a second adjacent tapered bed element arranged in a mutually mating configuration. The bed ... | 12/08/1987 |
| 4704141 | Apparatus for automatically transferring small quantities of liquid samples in gas chromatography A gas chromatograph, very small sample metering apparatus having a double hollow needle that is inserted downward into the sample vial to transfer pneumatically the entire sample quantity, on the order of 1 microliter, from the sample vial, through a tran... | 11/03/1987 |
| 4684465 | Supercritical fluid chromatograph with pneumatically controlled pump An apparatus for analyzing a process stream (1) via supercritical fluid chromatography including container means (10), extraction means (50) for drawing a sample volume from the process stream and injecting the sample volume into the supercritical fluid t... | 08/04/1987 |
| 4681678 | Sample dilution system for supercritical fluid chromatography An apparatus for analyzing a process stream (1) via supercritical fluid chromatography including container means (10), extraction means (50) for drawing a known sample volume from the process stream and injecting the sample volume into a known volume of s... | 07/21/1987 |
| 4553985 | Gas chromatography A gas chromatograph in which a first portion of sample peaks are eluted in forward flow mode and a second portion of sample peaks are eluted in reverse flow mode without loss of resolution.... | 11/19/1985 |
