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| Number | Title | Issue Date |
| 8117901 | Determination of slurry concentration A method for determining the concentration of a chromatographic medium in a liquid slurry comprises the steps of: providing a column (1) having a top end (3) and a bottom end (2) and adapted to retain a chromatographic medium therein; introducin... | 02/21/2012 |
| 8074494 | Plugged flow 2D chromatography The invention provided is a split-free nano-liter flow liquid chromatography system comprising at least a first and a second chromatographic column connected in series, wherein an autosampler is provided and programmed to inject samples and eluent solutions of incre... | 12/13/2011 |
| 7937990 | Liquid chromatograph and separation column A separation column and a liquid chromatograph using the separation column, which are capable of carrying out a high-speed analysis under high pressure and without a reduction in separation performance of the separation column. In the separation column, a sample and... | 05/10/2011 |
| 7402283 | Electrolytic eluent generator and method of use An acid or base is generated in an aqueous solution by the steps of: (a) providing a source of first ions adjacent an aqueous liquid in a first acid or base generation zone, separated by a first barrier (e.g., anion exchange membra... | 07/22/2008 |
| 7389678 | Column for analytical temperature rising elution fractionation (ATREF) The present invention relates to a column for performing analytical temperature rising elution fractionation (ATREF) characterized in that the packing of said column comprises elastic wires having a good elasticity and a good thermal conductivity. The present invent... | 06/24/2008 |
| 7337660 | Method and system for reservoir characterization in connection with drilling operations A method for analyzing reservoir fluids in connection with a drilling operation includes determining composition and isotopes of injection fluids injected into a wellbore during a drilling operation and production fluids recovered from the wellbore during the drilli... | 03/04/2008 |
| 7329386 | Column packing material and method for producing the same The first subject of this invention is a column packing material comprising: a silica gel having a silanol group; a first chemical modification group which is bound to said silanol group; a silicon... | 02/12/2008 |
| 7267765 | Protection of the chromatographic bed in dynamic axial compression chromatography devices The invention relates to a chromatography device comprising: a column (12) intended to house, between its two ends (16a, 16b) a chromatographic bed (14) and a fluid to be chromatographed, a... | 09/11/2007 |
| 7231819 | Chemical sensor for wellbore applications There is described an analyzing device having two separation units to separate molecular species to detect molecular species in wellbore fluids with both separation units operating under forced flow conditions to provide for an active separation of subterranean well... | 06/19/2007 |
| 6989129 | Automated capillary liquid chromatography small volume analysis system A system for automatically performing liquid chromatography analysis of low volume liquid chemical samples at nanosecond flow rates using an analysis column that integrates a pre-concentration trapping column and a chromatography separation column terminating at an ... | 01/24/2006 |
| 6955922 | Large capacity acid or base generator and method of use Method and apparatus for generating an acid or base, e.g. for chromatographic analysis of anions. For generating a base the method includes the steps of providing a cation source in a cation source reservoir, flowing an aqueous liquid stream through a base generatio... | 10/18/2005 |
| 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 |
| 6761855 | Column for solid phase processing The present invention is directed to an improved column for use in solid phase synthesis or purification. In a specific embodiment, the column is a disposable plastic column for use in solid phase synthesis or purification of complex chemicals, such as biomolecules ... | 07/13/2004 |
| 6688161 | Perchlorate analysis device and method The present invention comprises a device and method of analyzing trace amounts of perchlorate in liquid samples comprising a concentrator column used in an ion chromatographic system that comprises an anionic capacity ranging from about 0.030 microequival... | 02/10/2004 |
| 6682701 | Large capacity acid or base generator apparatus Method and apparatus for generating an acid or base, e.g. for chromatographic analysis of anions. For generating a base the method includes the steps of providing a cation source in a cation source reservoir, flowing an aqueous liquid stream through a bas... | 01/27/2004 |
| 6668623 | Method and apparatus for analyzing organic macromolecular component and application thereof A method and apparatus for efficiently analyzing an organic macromolecular component contained in a sample with high precision are provided. The method and apparatus for analyzing the organic macromolecular component are based on a flow analysis method wi... | 12/30/2003 |
| 6613235 | Method of detecting sample ions by continuous electrochemical regeneration of a stationary phase An apparatus and method for electrochemically modifying the retention of a species on a chromatography material is disclosed. The apparatus comprises a housing having an effluent flow channel adapted to permit fluid flow therethrough. The effluent flow ch... | 09/02/2003 |
| 6591862 | System and method for carrying out column tests under hydrostatic pressure A closed ƊPstat -installation is disclosed for the potential-independent control of the pressure difference for continuous column tests under high hydrostatic pressure, as well as a pressure difference control process useful in particular for ... | 07/15/2003 |
| 6585937 | Electrochemical analysis system A sample pre-separation and concentration system for detecting low levels of analytes in highly complex mixtures includes a plurality of trapping columns having a high selectivity for classes of compounds of interest, upstream of a standard separation col... | 07/01/2003 |
| 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 |
| 6509085 | Fabrication of microfluidic circuits by printing techniques Laminates having microfluidic structures disposed between sheets of the laminate are provided. The microfluidic structures are raised on a sheet of laminate, typically by printing the structure on the sheet. Printing methods include Serigraph, ink-jet, in... | 01/21/2003 |
| 6500671 | Loading microcolums for the separation of analytes from a sample in the millisecond time scale The present invention generally relates to a microcolumn capable of separating an analyte from a sample in the millisecond time domain. The microcolumn is capable of such rapid separation by employing small column volumes that can tolerate medium to high ... | 12/31/2002 |
| 6316270 | Acid base or generator A method for generating high purity acid or base in an aqueous stream for use as an eluent for chromatography and, particularly, ion chromatography. For generating a base for anion chromatography, the aqueous stream is directed through a cation exchange b... | 11/13/2001 |
| 6277258 | Device and method for focusing solutes in an electric field gradient An electrophoretic device and method for focusing a charged solute is disclosed. The device includes a first chamber for receiving a fluid medium, the first chamber having an inlet for introducing a first liquid to the chamber and an outlet for exiting th... | 08/21/2001 |
| 6225129 | Large capacity acid or base generation apparatus and method of use Method and apparatus for generating an acid or base, e.g. for chromatographic analysis of anions. For generating a base the method includes the steps of providing a cation source in a cation source reservoir, flowing an aqueous liquid stream through a bas... | 05/01/2001 |
| 6074725 | Fabrication of microfluidic circuits by printing techniques Laminates having microfluidic structures disposed between sheets of the laminate are provided. The microfluidic structures are raised on a sheet of laminate, typically by printing the structure on the sheet. Printing methods include Serigraph, ink-jet, in... | 06/13/2000 |
| 6036921 | Acid or base generator with chromatograph An apparatus for generating high purity acid or base in an aqueous stream for use as an eluent for chromatography and, particularly, ion chromatography. For generating a base for anion chromatography, the aqueous stream is directed through a cation exchan... | 03/14/2000 |
| 5997708 | Multilayer integrated assembly having specialized intermediary substrate A multilayer integrated assembly for effecting fluid handling functions includes complementary microstructures formed by an etching or similar process in a planar foldable substrate. The complementary microstructures may be superimposed in a controlled ma... | 12/07/1999 |
| 5911954 | Integral fitting and filter An integral fitting and filter assembly includes a tubular body (119) having a integral proximal fitting piece (121) and an integral distal fitting piece (122). A central passage (125) extends through the proximal fitting piece and the distal fitting piec... | 06/15/1999 |
| 5811665 | Large scale sorption-driven solid state chromatography A system for preparative sorption driven chromatographic separation of organic compounds comprising a chromatographic element having a focusing zone in a porous tip with a vertex having a first diameter for receiving sample and solvent and a base having a... | 09/22/1998 |
| 5773615 | Intermittent electrolytic packed bed suppressor regeneration for ion chromatography Method and apparatus for ion chromatography including passage of sample through a chromatographic separation column, through a suppressor column containing a resin with exchangeable ions, and then through a detector. The suppressor column is equipped with... | 06/30/1998 |
| 5759405 | Apparatuses and methods for electrochemically modifying the retention of species on chromatography material An apparatus and method for electrochemically modifying the retention of a species on a chromatography material is disclosed. The apparatus comprises a housing having an effluent flow channel adapted to permit fluid flow therethrough. The effluent flow ch... | 06/02/1998 |
| 5730943 | Integral fitting and filter of an analytical chemical instrument An integral fitting and filter assembly includes a tubular body (119) having a integral proximal fitting piece (121) and an integral distal fitting piece(122). A central passage (125) extends through the proximal fitting piece and the distal fitting piece... | 03/24/1998 |
| 5719322 | Zeolitic capillary columns for gas chromatography Methods have been found to prepare fused silica capillary gas chromatographic columns where the stationary phase is a molecular sieve affixed to the silica capillary wall without the aid of an organic binder by modifying the interior surface of the silica... | 02/17/1998 |
| 5671928 | Seal for chromatography column having ridges An annular seal for chromatography columns adapted for radial sealing with an inner cylindrical surface, having a compressive surface disposed on the inner annular edge of the seal, and a sealing surface disposed on the outer annular edge of the seal, whe... | 09/30/1997 |
| 5641893 | Chromatographic separation apparatus An apparatus for the monitoring of a column chromatography separation process includes a segmented column with a seal positioned at the joint defined by the segments of the column. A connector is provided for connecting the segments of the column together... | 06/24/1997 |
| 5610322 | Device for packing chromatography columns A device, consisting of a chromatography column which is closed off at the top by a plunger and, at the bottom, by a connection piece and has one or more lateral openings in the upper part, a container that contains suspended chromatography material and i... | 03/11/1997 |
| 5593564 | Microcolumn-microcolumn flow interface and method A flow gating interface system including a first microcolumnar section, a second microcolumnar section, and a channel for interfacing a first fluid conduit and a second fluid conduit is provided. The channel, having an inwardly facing wall, encloses at le... | 01/14/1997 |
| 5589063 | Column analyzer system and improved chromatograph column for use in the system An analyzer system for automatic column chromatography includes chromatographic columns which are mounted in a rack. A drop removal mechanism system shakes the rack to transfer the last drop of eluate from the tip of a chromatographic column to a receptac... | 12/31/1996 |
| 5587323 | Meconium assay procedure A improved method for preparing a concentrated meconium extract containing basic and acid-neutral target analytes present in a meconium sample suspected of containing the target analytes is provided. The meconium sample is extracted with a mixed solvent o... | 12/24/1996 |
