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| Number | Title | Issue Date |
| 7824478 | 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... | 11/02/2010 |
| 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 |
| 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 |
| 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 |
| 7363810 | Corrosion resistant metal made thermal type mass flow rate sensor and a fluid supply device using the same A corrosion resistant thermal type mass flow rate sensor, and a fluid supply device employing the sensor are provided thus allowing enhanced corrosion resistance of the thermal type mass flow rate sensor, improve responsiveness, to be achieved particle-free, and to ... | 04/29/2008 |
| 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 |
| 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 |
| 7347080 | Thermal conductivity detector A thermal conductivity detector (TCD) utilizes a modular thermistor assembly that mounts to the TCD body. The thermistor assembly is easily replaceable in the TCD. Within the TCD, a thermistor bead is always held in the same relative location in a gas flow path, whi... | 03/25/2008 |
| 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 |
| 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 |
| 7303610 | Chromatography column assembly Chromatography column assembly of the direct heating type, comprising at least a capillary column, at least a tubular structure which envelops the capillary column and is coaxial with it, means to directly heat the column, means to detect the temperature of the colu... | 12/04/2007 |
| 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 |
| 7258132 | Electronically controlled back pressure regulator An electronically controlled back pressure regulator comprises an analysis device having a vent coupled to the analysis device through a vent path, a pressure sensor coupled to the vent path, a proportional valve coupled to the vent path, the proportional valve conf... | 08/21/2007 |
| 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 |
| 7194890 | Gas chromatograph and expired air component analyzer A gas chromatograph having the capability of performing a reliable measurement under a condition that the baseline of a detector output is stabilized, and a breath component analyzer using the same are provided. This gas chromatograph comprises a gas separation colu... | 03/27/2007 |
| 7168298 | Mass-sensitive chemical preconcentrator A microfabricated mass-sensitive chemical preconcentrator actively measures the mass of a sample on an acoustic microbalance during the collection process. The microbalance comprises a chemically sensitive interface for collecting the sample thereon and an acoustic-... | 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 |
| 7137286 | Gas chromatograph set A gas chromatograph set of the present invention comprises a plurality of gas chromatographs and a flow passage assembly. Each of the gas chromatographs includes a column for separating sample-components, a carrier gas supply unit for supplying a carrier gas to the ... | 11/21/2006 |
| 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 |
| 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 |
| 7115422 | Separation apparatus including porous silicon column A sample separation apparatus including a porous, or rough, capillary column. The porous capillary column includes a matrix which defines pores, and may be formed rough surface of hemispherical grain silicon. The capillary column is defined in a surface of a substra... | 10/03/2006 |
| 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 |
| 7078679 | Inductive detection for mass spectrometry The invention provides devices, device configurations and methods for improved sensitivity, resolution and efficiency in mass spectrometry, particularly as applied to biological molecules, including biological polymers, such as proteins and nucleic acids. More parti... | 07/18/2006 |
| 7000452 | Phased micro fluid analyzer A micro fluid analyzer having a concentrator and separator. A strip continuous through a channel in the concentrator may provide a hot zone that may move with the flow of fluid through the channel of the concentrator to provide a concentration of heat in the flow. A... | 02/21/2006 |
| 6974495 | 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... | 12/13/2005 |
| 6929678 | Purge and trap concentrator with improved drying A purge and trap concentrator and a method for drying a stream of sample gas in a gas analysis instrument. A dryer tube has an inlet that receives a stream of sample gas during a drying interval and receives a stream of dry gas during a regeneration interval. The dr... | 08/16/2005 |
| 6914220 | Microelectromechanical heating apparatus and fluid preconcentrator device utilizing same A microelectromechanical heating apparatus and fluid preconcentrator device utilizing same wherein heating elements of the apparatus are sized and spaced to substantially uniformly heat a heating chamber within a heater of the apparatus. Tall, thermally-isolated hea... | 07/05/2005 |
| 6906322 | Charged particle source with droplet control for mass spectrometry The invention provides devices, device configurations and methods for improved sensitivity, detection level and efficiency in mass spectrometry particularly as applied to biological molecules, including biological polymers, such as proteins and nucleic acids. In one... | 06/14/2005 |
| 6894784 | Foam detector and disruptor An apparatus and method are disclosed to detect foam above a liquid sample in a sparge vessel, and disrupt any foam that may exist. The foam sensor includes an optical emitter and optical sensor coupled to a sparge vessel above the level of the liquid sample. Foam i... | 05/17/2005 |
| 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 |
| 6719826 | Method and apparatus for sample injecting in gas chromatography A method and an apparatus for sample injection in gas chromatography increases the injecting volume of a sample, and can analyze any of high-boiling-point compounds, low-compounds boiling-point compounds, and compounds decomposed by heat. A sample is injected into a... | 04/13/2004 |
| 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 |
| 6706091 | Sub-to super-ambient temperature programmable microfabricated gas chromatography column A sub- to super-ambient temperature programmable microfabricated gas chromatography column enables more efficient chemical separation of chemical analytes in a gas mixture by combining a thermoelectric cooler and temperature sensing on the microfabricated column. Su... | 03/16/2004 |
| 6701774 | Parallel gas chromatograph with microdetector array Gas chromatographs of the invention generally comprise four or more analysis channels. Specifically, four or more gas chromatography columns are configured for parallel analysis of four or more gaseous samples with detection being effected using a microde... | 03/09/2004 |
| 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 |
| 6666907 | Temperature programmable microfabricated gas chromatography column A temperature programmable microfabricated gas chromatography column enables more efficient chemical separation of chemical analytes in a gas mixture by the integration of a resistive heating element and temperature sensing on the microfabricated column. ... | 12/23/2003 |
