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| Number | Title | Issue Date |
| 7824471 | Chromatographic systems and methods for eliminating interference from interfering agents The present invention provides a chromatographic method for eliminating interference from interfering agents, coming from the gas sample itself or from the system material used to perform the impurities measurements, on impurities to be quantified in a gas sample. T... | 11/02/2010 |
| 7691181 | System for controlling flow into chromatographic column using transfer line impedance A system for controlling the flow rate into a chromatographic column is disclosed generally comprising communicating a fluid to the column through a transfer line, measuring the inlet pressure, determining the outlet pressure, and adjusting the applied pressure unti... | 04/06/2010 |
| 7572319 | Analyte pre-concentrator for gas chromatography An analyte pre-concentrator for gas chromatography is disclosed generally comprising a tube packed with an adsorbent, wherein the tube may serve as the liner of a chromatographic injector, as an adsorbent trap coupled to a chromatographic column, and/or as an adsorb... | 08/11/2009 |
| 7544233 | Gas chromatograph with a mass spectrometer situated down therefrom, and method for performing the gas chromatographic/mass spectrometric analysis of a substance mixture The aim of the invention is to optimize the analysis of substances separated by gas chromatography with a gas chromatograph, comprising a separating device and a mass spectrometer situated down there from. To this end, a detector that detects the separated substance... | 06/09/2009 |
| 7468095 | System for controlling flow into chromatographic column using transfer line impedance A system for controlling the flow rate into a chromatographic column is disclosed generally comprising communicating a fluid to the column through a transfer line, measuring the transfer line inlet pressure, determining the transfer line outlet pressure, and adjusti... | 12/23/2008 |
| 7422625 | Methods and systems for characterizing a sorbent tube Disclosed are systems and methods that include providing a 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 for a known flow rate at the outlet; and, determi... | 09/09/2008 |
| 7409850 | Systems and methods for maximizing heat transfer efficiency to and minimizing thermal gradients in an analytic column An improved gas chromatograph system includes a radiant source, an insert located to receive an output of the radiant source, and an analytic column wound on a concave surface of the insert so that successive coils of the wound analytic column are in direct contact ... | 08/12/2008 |
| 7403858 | Method for detecting an occurrence zone of a mantle diapir finger location The invention covers the mining industry. Detection method of the occurrence zone of the mantle substance diapir finger consisting in that that geological observation are carried out in riftzones banked up by diapirs of the abnormal mantle and places of location of ... | 07/22/2008 |
| 7396386 | Method and apparatus for keeping constant the retention times in a gaschromatographic analysis A method for obtaining reproducibility of the retention times of the components of a mixture to be analysed in an apparatus for gaschromatographic analysis provided with a capillary column, when there occurs one of the following variations: variation in the length o... | 07/08/2008 |
| 7384453 | Self-contained chromatography system A self-contained chromatography system is provided and includes a chromatography column, a carrier gas reservoir containing a carrier gas and an analyte stream processing device, wherein the carrier gas reservoir is disposed upstream from the chromatography column a... | 06/10/2008 |
| 7384457 | Seal for gas chromatography A seal forming a fluid tight connection between a gas chromatography column and a sample inlet assembly is disclosed. The seal is formed by a metal injection molding process. The seal has a first surface adapted for sealing with the sample inlet assembly and a secon... | 06/10/2008 |
| 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 |
| 7368000 | Treatment of effluent gases A method is described for recovering a noble gas, such as xenon or krypton, from a first gas mixture comprising a plurality of components, one of which is the noble gas and the others are typically helium and/or nitrogen, argon, and relatively light fluorocarbons. T... | 05/06/2008 |
| 7360394 | Multi-purpose modular pyrolysis and thermal processing system for chemical and biological threat agent detection A multi-purpose modular pyrolysis and thermal processing system (MPMPTPS) for pyrolyzing and/or vaporizing liquids and solids to create an evolved vapor suitable for introduction into a gas-chromatography and/or vapor detection system, thereby allowing detection, cl... | 04/22/2008 |
| 7361206 | Apparatus and method for water vapor removal in an ion mobility spectrometer The present invention is directed to an apparatus and a method for continuously removing water vapor from a closed loop, re-circulated gas flow in an ion mobility spectrometer using a water permeable membrane, having a first side and a second side opposite the first... | 04/22/2008 |
| 7343779 | High performance, hand-held gas chromatograph, method and system A hand-held, ultra-sensitive gas chromatograph which provides real time detection and analysis of chemical compounds or impurities is disclosed. The detection sensitivity ranges from parts per trillion to parts per million with an average retention time ranging from... | 03/18/2008 |
| 7326922 | Gas sensor with one point calibration System and method for calibrating a sensor comprises a detector capable of detecting electromagnetic radiation at least at a radiation wavelength of interest, an analyzer capable of determining concentration values in response to the detected radiation, and a calibr... | 02/05/2008 |
| 7316730 | Inlet double-seal assembly An inlet seal assembly for sealing an injection port member in a chromatography instrument , comprising an injection port member having a raised metal ring, an inlet seal member with an upper surface, a peripheral groove formed in the inlet seal member upper surface... | 01/08/2008 |
| 7314505 | Stationary phase deposition based on onium salts Onium salt chemistry can be used to deposit very uniform thickness stationary phases on the wall of a gas chromatography column. In particular, the stationary phase can be bonded to non-silicon based columns, especially microfabricated metal columns. Non-silicon mic... | 01/01/2008 |
| 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 |
| 7309377 | Method for separation of isotopes This invention relates to a method for separation of isotopes, that is, to obtain isotopically pure fractions by separating natural 1 isotope mixtures in elements, where hydrogen is employed as ligand on the elements that are to be isotopically separated, and where ... | 12/18/2007 |
| 7306649 | 3D miniature preconcentrator and inlet sample heater The present invention relates to a three dimensional preconcentrator and inlet heater. The preconcentrator consists of a substrate with passageways, a conductive material coated to the top and the bottom of the substrate and an adsorbent coating covering the entire ... | 12/11/2007 |
| 7305866 | Mass spectrometry A method of gas chromatograph mass spectrometry with a negative chemical ionization (NCI) process includes analyzing a standard substance for the NCI by deriving with a derivatization reagent a fatty acid with a multiple number of carbon atoms, measuring the standar... | 12/11/2007 |
| 7300801 | Welded sample preparation articles and methods Solid phase extraction articles, well-less filtration devices, and methods of manufacturing the articles and devices are disclosed. Methods of extracting analytes from samples using the articles and devices are also disclosed. The articles, devices and methods inclu... | 11/27/2007 |
| 7284410 | Chromatographic interface for thermal desorption systems Disclosed are systems and methods that include a thermal desorption unit, a chromatographic column, and an interface device between the unit and the column. The interface device controls the fluid flowing into the column, such as by providing additional carrier gas ... | 10/23/2007 |
| 7276158 | Incision-based filtration/separation pipette tip This invention relates to a pipette tip designed to perform filtration or sample separation on the basis of one or more perforations, holes or incisions performed on the tip. Such perforation, holes or incisions are large enough to permit the passage of fluids or sm... | 10/02/2007 |
| 7273517 | Non-planar microfabricated gas chromatography column A non-planar microfabricated gas chromatography column comprises a planar substrate having a plurality of through holes, a top lid and a bottom lid bonded to opposite surfaces of the planar substrate, and inlet and outlet ports for injection of a sample gas and elut... | 09/25/2007 |
| 7269994 | Chromatograph/mass spectrometer The present invention provides a chromatograph/mass spectrometer capable of producing a composite chromatogram from plural chromatogram signals without causing the baseline level to rise or the intensity of the chromatogram peak to decrease. The chromatograph/mass s... | 09/18/2007 |
| 7267796 | Preparative liquid chromatograph using plural detectors The preparative liquid chromatograph uses a plurality of detectors including a mass spectrometer, and a chromatogram generator is provided for generating a plurality of chromatograms each corresponding to each of the plurality of detectors. The plurality of chromato... | 09/11/2007 |
| 7267709 | 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 ... | 09/11/2007 |
| 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 |
| 7258726 | Method and apparatus for measuring velocity of chromatographic pulse An Apparatus and method for two-stage chromatographic separation uses thermal modulation. The chromatographic column or modulation tube (1) has a loop structure such that two portions of modulation tube (1) can be thermally modulated simultaneously by ... | 08/21/2007 |
| 7256052 | Chemical reaction and analysis system This invention is to a microreactor type of reaction and analysis system. The system includes a chemical reaction chamber having internal conduits through which a chemical reactant, such as a reaction gas, can be fed. The conduits for transporting fluids such as rea... | 08/14/2007 |
| 7247189 | Device for combining two fluid streams A fluidic switching device is particularly for use in chromatography is described. The device allows a rapid switching between chromatographic columns; particularly, in gas chromatography. ... | 07/24/2007 |
| 7246013 | Data processor for use in chromatographic analysis A data processor for analyzing chromatograms in detail and collecting analysis-associated information necessary for verification of data validity throughout an analysis process. The data processor includes a first data collecting section which collects and records a... | 07/17/2007 |
| 7219532 | System for regulating fluid flowing through chromatographic column Disclosed are systems and methods that include a sampling device, a chromatographic column, and a transfer line through which a fluid containing analytes to be measured are communicated from the sampling device to the column. The pressure at which the fluid containi... | 05/22/2007 |
| 7168296 | 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 ... | 01/30/2007 |
| 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 |
| 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 |
| 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 |
