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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...
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7559226 |
Radiant thermal energy absorbing analytical column
An analytical column includes a coating that absorbs at least one of ultraviolet (UV) and visible (VIS) radiant energy and converts the radiant energy into heat.
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7552617 |
Automated system for detection of chemical compounds
An automated system for processing a liquid test sample is provided. The disclosed automated system comprises a gas and liquid separator; an attachment for a first gas source that provides a flow...
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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...
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7524363 |
Gas chromatograph column assembly
A separation column assembly for a gas chromatograph and the like is provided. The assembly is a self contained unit which allows very rapid heating and cooling of the column.
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7520920 |
Guard columns for gas chromatographs and gas chromatograph-mass spectrometers
The present invention discloses a gas chromatograph assembly. In one implementation, the assembly includes a sample injector and a guard column assembly. The guard column assembly includes a guard...
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7513936 |
Flat spiral capillary column assembly with thermal modulator
The gas chromatography (GC) column assembly described herein consists of capillary GC column material, such as fused silica or metal capillary tubing, which is constrained to lie in a flat,...
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7485175 |
Device for positioning and holding a length of gas chromatographic column
The invention relates to a device for positioning and holding one or more chromatographic column lengths being subjected to one or more jets of fluid to change the temperature, especially in a...
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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...
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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...
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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...
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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.
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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,...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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6514316 |
System for improving the maximum operating temperature and lifetime of chromatographic columns
Capillary column oxidation in gas chromatography systems, particularly of polyimide clad columns, is a major cause of column failure and it limits the maximum temperature at which columns can be...
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6485543 |
Gas chromatography oven heaters
A gas chromatography system with suspended tubular separation column(s) in an enclosed convection oven where a gas medium is heated by at least two electrically powered heaters. A kit to modify gas...
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6460401 |
Method and apparatus for trace analysis of organic compound
The invention relates to a method of trace analysis of organic compounds which calls for the steps of setting a test piece in a flow cell, and thereafter removing organic compounds from the test...
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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...
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6427522 |
Fast temperature programmed gas chromatograph
A temperature programmed module for use in a gas chromatograph. The module has micropacked column and inner and outer jacket tubes. The inner jacket tube surrounds the column to provide a space...
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6423120 |
Sample introduction systems and methods
A preferred sample introduction apparatus includes a wall that defines a channel, with the channel being configured to receive a sample and being adapted to engage in fluid communication with the...
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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...
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6354136 |
Gas chromatograph with a temperature-controlled injector
The invention relates to a gas chromatograph having a temperature-controlled injector for containing a vaporizer tube with chemical substances, thereon to be analyzed via a gas chromatography...
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6345528 |
High-temperature characterization of polymers with HPLC system having multiple mobile-phase reservoirs
Rapid characterization and screening of polymer samples to determine average molecular weight, molecular weight distribution and other properties is disclosed. Rapid flow characterization systems...
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6341520 |
Method and apparatus for analyzing breath sample
Method and apparatus for analyzing a breath sample provide user-friendly operation and analysis. The method and apparatus provide automatic operation and coordination of operation of an absorbent...
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6316759 |
Microwave heating apparatus for gas chromatographic columns
A microwave heating apparatus is used for heating a chromatographic column assembly containing a microwave absorbing material. The microwave heating apparatus includes an antenna transmitting a...
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6260407 |
High-temperature characterization of polymers
Rapid characterization and screening of polymer samples to determine average molecular weight, molecular weight distribution and other properties is disclosed. Rapid flow characterization systems...
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6257047 |
Method and apparatus for the introduction of large volume samples in capillary columns for gas chromatography
The invention concerns a method and an apparatus for the direct injection of large volumes (>3 μl) of samples into the column in a gas chromatography analysis apparatus comprising an oven, a...
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6248158 |
Oven housing module in an analytical instrument
Energy efficiency of a thermal zone in an analytical instrument is improved by use of an oven housing module having an enclosure body defining an oven cavity, wherein the enclosure body exhibits a...
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