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| Number | Title | Issue Date |
| 7806963 | Apparatus, system, and method for improved power utilization in a gas chromatography sensor An apparatus, system, and method are disclosed for broad spectrum chemical detection. The method includes detecting an ambient temperature and setting a target temperature based on the ambient temperature. The target temperature is a temperature greater than the amb... | 10/05/2010 |
| 7534286 | Methods and systems for cooling a chromatographic column Systems and methods for cooling a chromatographic column is disclosed generally, comprising heating a chromatographic column, supplying fluid into the column via the inlet end of the column at an inlet pressure, decreasing the temperature of the column, thereby caus... | 05/19/2009 |
| 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 |
| 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 |
| 7363801 | Gas chromatograph sample injector In a sample injector for a gas chromatograph, the present invention improves the throughput of a GC analysis including the derivation of a target compound and reduces the tedious work of handling a reagent for the derivation. According to the present invention, a de... | 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 |
| 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 |
| 7306656 | Gas chromatography apparatus The invention relates to a gas chromatography apparatus with a cooling device, wherein the cooling device includes a closed cooling circuit containing a refrigerant, so that no refrigerant is wasted. ... | 12/11/2007 |
| 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 |
| 7291203 | Negative temperature profiling using microwave GC apparatus A method is disclosed for performing GC separations using a separation protocol including at least one negative temperature ramp, where the negative temperature ramp is controlled either by the introduction of a gaseous coolant at a controlled and adjustable rate or... | 11/06/2007 |
| 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 |
| 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 |
| 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 |
| 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 |
| 7127901 | Helium management control system A helium management control system for controlling the helium refrigerant supply from a common manifold supplies a plurality of cryogenic refrigerators with an appropriate helium supply. The system employs a plurality of sensors to monitor and regulate the overall r... | 10/31/2006 |
| 7107818 | Method and device for comprehensive two-dimensional gas chromatography A method for detecting substances or mixtures of substances within a sample in an apparatus for comprehensive two-dimensional gas-chromatographic analysis according to the present invention, comprising the steps of: subjecting the ... | 09/19/2006 |
| 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 |
| 7081182 | Method and apparatus for automatically measuring the concentration of TOC in a fluid used in a semiconductor manufacturing process The present invention relates to a method and apparatus for automatically measuring the concentration of total organic carbon (TOC) in chemicals and ultra-pure water that are used in a wet etch process. The apparatus includes a sampling line extending from a process... | 07/25/2006 |
| 7063784 | Processing of chemicals in flow-through device with porous media A method of processing a sample comprising introducing a sample into a flow-through device containing a porous solid media therein, and thereafter subjecting the device to microwave energy. ... | 06/20/2006 |
| 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 |
| 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 |
| 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 |
| 6907796 | Temperature-controlled injector for a chemical analysis unit The invention relates to a temperature-controlled injector for a chemical analysis unit, in particular a gas chromatograph, comprising an injector tube, which can be received by a receiving tube, having a cooling system, which surrounds the receiving tube, through w... | 06/21/2005 |
| 6907768 | Device for coupling a microchromatograph with a mass spectrometer and analysis device A coupling device connecting the output of a microchromatograph (μCG) to the input of a mass spectrometer (MS), said coupling device comprising a capillary tube with one end connected in sealed fashion to the source under vacuum of the mass spectrometer through the... | 06/21/2005 |
| 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 |
| 6779379 | Method and device for vaporization injection The invention concerns a device for vaporizing injections of samples into a gas chromatography analysis device, comprising a vaporization chamber elongated lengthways and heated, as well as a syringe equipped with a needle, the device being of the type in which the ... | 08/24/2004 |
| 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 |
| 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 |
| 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 |
| 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 |
| 6638346 | Vaporization injector A vaporization injector for gas chromatography analysis instruments, of the type including a vaporization chamber, heated or which may be heated, with a longitudinally elongated shape, a device for hermetically inserting the needle of a syringe containing... | 10/28/2003 |
| 6607581 | Passive sampling badge A passive air sampler is designed to facilitate emptying granular or particulate adsorbent from it directly into a thermal desorption tube or other vessel for use in an analytical instrument. The preferred form has an adsorbent container in a conical or f... | 08/19/2003 |
| 6607580 | Separation column for a gas chromatograph A separation column for a gas chromatograph that includes a block of electrically insulating material having a channel located between two strips of thermoelectric material spaced from the channel by strips of electrically insulating material. Electrodes ... | 08/19/2003 |
| 6601439 | Method of reducing baseline instabilities in liquid chromatographic measurements and liquid chromatography apparatus A method of reducing baseline instabilities in liquid chromatographic measurements is disclosed. A mobile phase comprising sample substances passes through a chromatographic column comprising a stationary phase, and subsequently through a detector. An add... | 08/05/2003 |
| 6579345 | Chromatography apparatus with direct heating of the capillary column A method and an apparatus for chromatography are described, wherein at least one element in electrically conductive material is provided to heat the capillary column in a direct way and wherein the control of the temperature is carried out according to a ... | 06/17/2003 |
| 6550961 | Thermal conductivity detector A thermal conductivity detector includes not only a thermal conductivity detector cell disposed so as to be heated by heat transmitted from a first heater block and a column connector connected to the detector cell and to a column of a chromatograph but a... | 04/22/2003 |
| 6547852 | Transverse thermal modulation A method of thermally modulating a tubular member carrying a sample substance therethrough is provided. The method includes the steps of (a) directing at least one gas stream toward a tubular member in a direction substantially transverse to the tubular m... | 04/15/2003 |
