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| Number | Title | Issue Date |
| 7527676 | Unit for separating gas A unit for separating an exhaust gas containing PFC gases including CF4 and C2F6 generated in a production process, wherein the exhaust gas is concentrated in a concentration device, and then separated chromatographically in a chroma... | 05/05/2009 |
| 7383718 | Single stage flow modulator for performing comprehensive chromatography A single stage flow modulator for performing comprehensive chromatography comprises a first chromatographic column, a valve fluidically coupled to at least two fluid conduits, wherein when in a first position, the valve directs a control flow to direct an output of ... | 06/10/2008 |
| 7367216 | Phased micro analyzer V, VI A micro fluid analyzer having a concentrator and two or more separators. The analyzer may have one, two or more pumps. The analyzer may have a hyper pre-concentrator having a number of channels. There are numerous detectors positioned along the flow path of the anal... | 05/06/2008 |
| 7311757 | Analyte pre-concentrator for gas chromatography An analyte pre-concentrator for gas chromatography is disclosed generally comprising a tube having a restricted outlet and packed with an adsorbent, wherein the tube serves as the liner of a chromatographic injector, as an adsorbent trap coupled to a chromatographic... | 12/25/2007 |
| 7284409 | Thermal modulation for gas chromatography A thermal modulator device for gas chromatography and associated methods. The thermal modulator device includes a cooling member, an electrically conductive capillary in direct thermal contact with the cooling member, and a power supply electrically coupled to the c... | 10/23/2007 |
| 7260978 | Gas chromatography/mass spectrometry system A gas chromatography/mass spectrometry system includes two sample introduction parts, a gas chromatography part having two columns, a column oven for housing the two columns in a parallel configuration, an interface part through which an outlet end of each of the tw... | 08/28/2007 |
| 7147695 | Microfabricated microconcentrator for sensors and gas chromatography Devices for enhancing the sensitivity of a microsensor or any other micro device by providing on-line preconcentration. Microconcentrators that can be integrated with a sensor or a micromachined GC to enhance the signal to noise ratio can include a miniaturized sorb... | 12/12/2006 |
| 7111494 | Methods and systems for characterizing a sorbent tube Disclosed are systems and methods that include providing a vessel having an adsorbent disposed therein, the vessel having an inlet and an outlet for communicating a carrier gas through the vessel; determining a differential pressure between the inlet and the outlet ... | 09/26/2006 |
| 7104112 | Phased micro analyzer IV A fluid analyzer having a concentrator and separator for concentrating and separating fluid samples at pressures up to about 10,000 psi (˜700 bar). The concentrator and separator may consist of a solid-state thin-film heater-adsorber and a channel supported by a so... | 09/12/2006 |
| 7096886 | Multiport switching valve for a liquid flow system A multiport switching valve for a liquid flow system is described, comprising a first member having a plurality of ports for connecting liquid lines thereto, a second member, connected with a first member and movable relative to the first member, the second member c... | 08/29/2006 |
| 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 |
| 6955709 | Method and device for vaporization injection of high volumes in gas chromatographic analysis This invention concerns a method and apparatus for vaporization injection of large volumes of liquid sample (substance to be analysed+solvent) introduced by a syringe needle into a heated vaporization chamber which is part of an injector coupled operatively to a dev... | 10/18/2005 |
| 6902934 | Methods for identifying optimizing catalysts in parallel-flow microreactors A chemical processing microsystem useful for identifying and optimizing, materials (e.g., catalysts) that enhance chemical processes or for characterizing and/or optimizing chemical processes is disclosed. The chemical processing microsystem comprises a plurality of... | 06/07/2005 |
| 6877363 | Chromatography column The invention relates to a chromatography column for high-pressure liquid chromatography, which can be provided with different connection systems, such as a cartridge retaining device or a reducing screw. The column tube (1, 11) of the inventive chromatograph... | 04/12/2005 |
| 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 |
| 6834531 | Gas chromatograph modular auxiliary oven assembly and method for analyzing a refinery gas An auxiliary modular oven assembly for use with a gas chromatograph. The auxiliary oven assembly is comprised of a housing, an oven compartment, a heater, at least one sampling valve, at least one fixed volume sample loop, and at least one chromatograph column or co... | 12/28/2004 |
| 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 |
| 6702874 | Gas separation apparatus and gas separation method Using a distillation separator, a gas to be treated is separated into a plurality of gas groups having different boiling points. Then, the specific gases included in each of the plurality of gas groups separated at the first separator and having similar b... | 03/09/2004 |
| 6682699 | Reduced power consumption gas chromatograph system This invention provides a reduced power consumption gas chromatograph system (10) which includes a capillary gas chromatograph column member (12) which contains a chemical sample to be analyzed. The gas chromatograph system further includes a heating mech... | 01/27/2004 |
| 6656738 | Internal heater for preconcentrator An apparatus for collecting and detecting chemicals contained in a fluid includes a sorbent element, at least one chemical sensor, a first pump for pumping fluid through the sorbent element and a second pump for pumping fluid to the chemical sensor. The s... | 12/02/2003 |
| 6632268 | Method and apparatus for comprehensive two-dimensional gas chromatography A two-dimensional gas chromatograph with a primary column (14) and dual secondary columns (26, 28) is described. Flow rates in the primary column are less than those in the secondary columns due to an accumulation valve (16). Typically the ratio of second... | 10/14/2003 |
| 6551387 | Gas separation apparatus A discharge gas containing PFC gas including CF4 and NF3 generated from a manufacturing process (10) is adsorbed at an adsorbing device (18) and then desorbed using nitrogen as a purge gas. A desorbed gas with CF4 and NF | 04/22/2003 |
| 6541273 | Multiple sorbent cartridges for solid phase extraction Methods and apparatus are disclosed which are useful for detecting the presence of various pesticides, including aryl pyrazoles such as fipronil. Pesticide residues are extracted from a variety of samples, including soil and/or water samples using techniq... | 04/01/2003 |
| 6497138 | Multilayered gas chromatograph The present disclosure relates to a gas chromatograph having a plurality of layers or channels. The chromatograph typically comprises an inlet that receives a sample to be analyzed, a column disposed in each of the plurality of chromatograph layers, each ... | 12/24/2002 |
| 6447575 | Method and apparatus for gas chromatography analysis of samples The invention relates to gas chromatography analysis of a sample having components to be investigated and water contained therein, which after thermodesorption is separated and analyzed, the thermodesorbed sample being transferred by a carrier gas into a ... | 09/10/2002 |
| 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 |
| 6368559 | Device for analyzing organic compounds particularly in aqueous and gaseous samples A device for analyzing organic compounds, particularly in aqueous and gaseous samples, constituted by a duct which is supplied in input by a gas whose pressure can be controlled by means of a regulator connected to a capillary column which is connected in... | 04/09/2002 |
| 6306200 | Hand-held multiple system gas chromatograph A multiple parallel hand-held gas chromatograph (GC) system which includes several independent GCs. Each independent GC has its own injector, separation column, detector and oven and the GCs are mounted in a light weight hand-held assembly. Each GC operat... | 10/23/2001 |
| 6217829 | Reduced power consumption gas chromatograph system This invention provides a reduced power consumption gas chromatograph system (10) which includes a capillary gas chromatograph column member (12) which contains a chemical sample to be analyzed. The gas chromatograph system further includes a heating mech... | 04/17/2001 |
| 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 |
| 6068684 | Microstructure chromatograph with rectangular column A novel chromatograph is provided. The chromatograph includes an analytical column which is a channel with a rectangular cross-section. Integrated with the chromatograph are a sample collection channel and a restriction channel. The column, sample collect... | 05/30/2000 |
| 6033459 | Gas collection apparatus, gas analyzing apparatus using the same and gas analyzing method In a denuder (2) serving as a gas collection apparatus, an absorption liquid supply tube (4) for spraying absorption liquid from a nozzle (4a) to the inner wall of a denuder pipe (2a) is provided at the upper portion of the denuder pipe (2a). A sample atm... | 03/07/2000 |
| 6007602 | Apparatus and method for chemical modulation An apparatus and a method are described for forming a chemical modulation of a substance present in a fluid stream, which utilize a movable device, such as a movable heater, to induce changes in the retention of a chemical substance flowing through the mo... | 12/28/1999 |
| 6004514 | Process gas chromatographic system A gas chromatographic system for analyzing gas components includes an analyzer, a constant temperature oven, an analyzer case, an indicator, an integrated sample conditioner, and a coupler. The analyzer includes a sample valve having a detector and a heat... | 12/21/1999 |
| 5872306 | Real-time gas-chromatography mass-spectrometry trace vapor detection A gas flow distribution system accumulates a sample from a sample bearing carrier gas in a micro-accumulator, delivers it using a carrier gas to a gas chromatography column, and supplies a carrier gas to the gas chromatography column to facilitate separat... | 02/16/1999 |
| 5846292 | Chromatograph with column extraction A gas chromatograph and method of chromatography are provided. Analytes, those compounds to be tested, are extracted from the sample by moving the sample into a column which has a stationary phase along the column walls. The column has two sections which ... | 12/08/1998 |
| 5686655 | Gas chromatograph/mass spectrometer system Conventionally, the mass spectrometer unit is placed beside the gas chromatograph unit when the gas chromatograph unit is coupled with a mass spectrometer unit, whereas the normal detector is placed on the top of the gas chromatograph unit when it is coup... | 11/11/1997 |
| 5611846 | Portable gas chromatograph Gas chromatographs are disclosed that may be constructed to be portable, light, rugged, fast, sensitive, and to use only utilities (compressed gas and electricity) that are readily available in the field. The gas chromatographs can also perform novel extr... | 03/18/1997 |
