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| Number | Title | Issue Date |
| 6790674 | Sampler To sample hot liquids containing volatile materials, the liquid is cooled in a refrigerator and pumped through a syringe needle into a container until the container overflows. The needle is removed slowly and the container is automatically closed as the needle is wi... | 09/14/2004 |
| 6755074 | Liquid chromatographic method and system To economically perform preparatory chromatography, a plurality of pumps each having a corresponding one of a plurality of pistons and a corresponding one of a plurality of cylinders are driven by one motor to draw and pump solvent simultaneously into corresponding ... | 06/29/2004 |
| 6749749 | Separation system, components of a separation system and methods of making and using them Permeable polymeric monolithic materials are prepared in a column casing. In one embodiment, the permeable polymeric monolithic materials are polymerized while pressure is applied through a piston having a smooth piston head in contact with the polymerization mixtur... | 06/15/2004 |
| 6565745 | Disposable chromatographic columns To make an inexpensive chromatographic column and perform chromatography with it, column walls and a column end with an inlet port are molded integrally from plastic and a snap-on end is molded integrally with an outlet port from plastic. A filter is plac... | 05/20/2003 |
| 6494331 | Sampler To sample liquids containing volatile materials, the liquid is pumped through a syringe needle into a container until the container overflows. The needle is removed slowly and the container is automatically closed as the needle is withdrawn, wherein liqui... | 12/17/2002 |
| 6427526 | Liquid chromatographic method and system To economically perform preparatory chromatography, a plurality of pumps each having a corresponding one of a plurality of pistons and a corresponding one of a plurality of cylinders are driven by one motor to draw and pump solvent simultaneously into cor... | 08/06/2002 |
| 6354345 | Pumping system To pump fluid into sample containers, a distributor arm of a sample collector is calibrated as to position in a computer memory and is moved from position to position over different containers while a counter in computer memory keeps track of its position... | 03/12/2002 |
| 6319410 | Apparatus and method for super critical fluid extraction To provide performance particularly in handling supercritical extraction systems, a specially designed pump includes a cam-driven, single-plunger with a cam having a profile that enables the pumping system to avoid destructive reverse torque on the cam, g... | 11/20/2001 |
| 6296769 | Multi-chambered supercritical fluid extraction cartridge and processes using it A multiple chamber sample holding cartridge is used with a supercritical fluid extractor that causes membranes dividing the cartridge into chambers to rupture upon the pressurization of the sample cartridge, thereby allowing the intermixing of materials c... | 10/02/2001 |
| 6294088 | Apparatus and method for supercritical fluid extraction or supercritical fluid chromatography A variable-orifice fluid restrictor for use with a supercritical extractor or chromatograph includes an inlet line for fluid at a pressure above its critical pressure, an extended tubular probe having an inner and an outer surface and a proximal and a dis... | 09/25/2001 |
| 6263747 | Remote installation method and tool To insert an instrument into a flow stream of a sewer pipe from the street, the instrument is fastened to a holder, which in turn is fastened to a portion of an expansion ring opposite its two opened edges. A cord is fastened to one of the edges of the ex... | 07/24/2001 |
| 6251267 | Apparatus for supercritical fluid extraction An apparatus for supercritical extraction is disclosed herein. The apparatus includes a plurality of containers adapted to hold a different one of a corresponding plurality of samples, a first transport means for carrying the plurality of sample container... | 06/26/2001 |
| 6241890 | Apparatus and method for supercritical fluid extraction To collect analyte from a supercritical fluid extractor, the collector lifts vials into place by a biasing means that guides the file up to the restrictor where it is sealed. The vial can be moved back down from the collecting mechanism even if frost form... | 06/05/2001 |
| 6178831 | Composite wastewater sampler A composite wastewater sampler includes a flow-through-chamber having an inlet port and an outlet port with a path between them that gradually increases in depth and width and then decreases in width. It is shaped to cause fluid to: (1) flow from the inle... | 01/30/2001 |
| 6152189 | Sampler To sample liquids containing volatile materials, the liquid is pumped through a syringe needle into a container until the container overflows. The needle is removed slowly and the container is automatically closed as the needle is withdrawn, wherein liqui... | 11/28/2000 |
| 6149814 | Apparatus and method for supercritical fluid extraction or supercritical fluid chromatography A variable-orifice fluid restrictor for use with a supercritical extractor or chromatograph includes an inlet line for fluid at a pressure above its critical pressure, an extended tubular probe having an inner and an outer surface and a proximal and a dis... | 11/21/2000 |
| 6123904 | Water impurity analyzer To determine the total organic carbon content of a flowing liquid in a continuous process, water and oxidizing agents enter lower ports in a multi-stage column and flow upwardly through residence chambers as they are mixed. Spaced apart along the upper pa... | 09/26/2000 |
| 6114172 | Process and device for determining the biological oxygen demand of sewage In order to determine the biological oxygen demand of sewage, a sample of sewage is taken into a reaction vessel in which there is a biological bath which is kept moving turbulently by an agitator. An oxygen probe measure the oxygen consumption per unit t... | 09/05/2000 |
| 6086767 | Apparatus and method for supercritical fluid extraction or supercritical fluid chromatography An automatic variable-orifice fluid restrictor for use with a supercritical extractor having a collection trap or a supercritical chromatograph includes an inlet line for fluid at a pressure above its critical pressure, an extended tubular probe having an... | 07/11/2000 |
| 6083399 | Apparatus and method for supercritical fluid extraction To avoid deposits on the restrictor that channels extractant into a collector, a heated capillary tube pressure release restrictor, has a thermally insulated outlet end in a collecting trap substantially colder than the capillary tube. The restrictor is h... | 07/04/2000 |
| 6081065 | Pumping system To draw samples from a source of liquid, a pumping system measures the amount of liquid being pumped by detecting pump cycles and calculating the pumped liquid from this measurement and stored data including conduit size, pressure head and statistical dat... | 06/27/2000 |
| 6071408 | Apparatus and method for supercritical fluid extraction To provide performance particularly in handling supercritical extraction systems, a specially designed pump includes a cam-driven, single-plunger with a cam having a profile that enables the pumping system to avoid destructive reverse torque on the cam, g... | 06/06/2000 |
| 5994146 | Water impurity analysis method To determine the total organic carbon content of a flowing liquid in a continuous process, water and oxidizing agents enter lower ports in a continuous column and flow upwardly along a helical path with air gaps as they are mixed. The helical reaction pat... | 11/30/1999 |
| 5981289 | Hydrogen sulfide analyzer A hydrogen sulfide analyzer that continuously samples waste water from a waste stream or reservoir and measures the concentration of purgeable H2 S present (H2 SP) This information, when combined with the volume of water present, pro... | 11/09/1999 |
| 5932095 | Multi-chambered supercritical fluid extraction cartridge A multiple chamber sample holding cartridge is used with a supercritical fluid extractor that causes membranes dividing the cartridge into chambers to rupture upon the pressurization of the sample cartridge, thereby allowing the intermixing of materials c... | 08/03/1999 |
| 5915932 | Peristaltic pump having a roller support The rollers of a peristaltic pump are supported to prevent said rollers from compressing said tube more than the thickness of the walls of the tube. A tube holder rotates along with the roller assembly of the peristaltic pump and keeps the tube in line wi... | 06/29/1999 |
| 5911881 | Apparatus and method for collecting analyte in supercritical fluid extraction To collect analyte from a supercritical fluid extractor, the collector lifts vials into place by a biasing device that guides the file up to the restrictor where it is sealed. The vial can be moved back down from the collecting mechanism even if frost for... | 06/15/1999 |
| 5843294 | Capillary electrophoresis sample injection technique To inject sample into a capillary tube of an electrophoresis apparatus, a vacuum tank is connected to one end of the tube while the other end is in sample to impart a pressure difference across the tube. The pressure in the pressure chamber is sensed, int... | 12/01/1998 |
| 5844137 | Purge system To measure flow rates, the cross-sectional shape of the flow path is changed by inserting a multiple position gate into the flow path and altering the position of the gate to maintain the head of liquid constant with a reduced flow cross section. The posi... | 12/01/1998 |
| 5777892 | Doppler shift velocity measuring system with correction factors To determine the average velocity of a fluid stream, an ultrasonic signal is transmitted into the fluid and reflected ultrasonic signal received. The signals are mixed with a frequency of the transmitted ultrasonic signals. A Fourier transform is performe... | 07/07/1998 |
| 5755559 | Apparatus and method for pumping supercritical fluid and measuring flow thereof In a piston pump for pumping liquid carbon dioxide at a temperature below 30 degrees Fahrenheit and pressures at least as high as 7500 psi, the volume leaving the pump is determined by measuring only pressure or other parameter related to flow and movemen... | 05/26/1998 |
| 5750027 | Apparatus and method for supercritical fluid extraction or supercritical fluid chromatography A variable-orifice fluid restrictor for use with a supercritical extractor or chromatograph includes an inlet line for fluid at a pressure above its critical pressure, an extended tubular probe having an inner and an outer surface and a proximal and a dis... | 05/12/1998 |
| 5738498 | Apparatus and method for thermoelectric cooling of an extraction fluid pump In a piston pump for pumping liquid carbon dioxide at a temperature below 30 degrees Fahrenheit and pressures at least as high as 7500 psi at an outlet flow rate in excess of 10 milliliters per minute, the inlet to the pump and the pumphead are each coole... | 04/14/1998 |
| 5733789 | Water impurity analysis method To determine the total organic carbon content of a flowing liquid in a continuous process, water and oxidizing agents enter lower ports in a multi-stage column and flow upwardly through residence chambers as they are mixed. Spaced apart along the upper pa... | 03/31/1998 |
| 5726360 | Fluid sampling apparatus having a universal base To draw samples of fluid at remote locations, one of a plurality of sampler configurations is selected from configuations that have a universal base, a selected one of a composite container holder or locator, 12-container rain water runoff container holde... | 03/10/1998 |
| 5701646 | Method of making a sensor A method of making a sensor wherein flexible conduit means is assembled with a fixture having a strain-sensitive film and electrical connections are made to the film whereby variations in fluid pressure in the conduit means can be detected.... | 12/30/1997 |
| 5690828 | Apparatus and method for supercritical fluid extraction To supply supercritical fluid to an automatic supercritical fluid extractor and collect extract from the extractor, sample holding cartridges are lifted one by one in series by an elevator plug into a pressure chamber. An inlet at the top of the cartridge... | 11/25/1997 |
| 5685965 | Capillary electrophoresis technique To detect bands in an electrophoresis capillary tube having a liquid separating medium, a light source and a light detector of a monitor are positioned on opposite sides of the capillary tube with the light source transmitting light through a first slit a... | 11/11/1997 |
| 5670048 | Preparatory supercritical fluid extraction using sealed chamber A preparatory supercritical extraction cartridge includes a chamber for sample having a volume in the range of 20 cubic centimeters to 2,000 cubic centimeters. An inlet and an outlet are fastened to the cartridge walls by threads and sealed to said cartri... | 09/23/1997 |
| 5653885 | Apparatus and method for supercritical fluid extraction To avoid deposits on the restrictor that channels extractant into a collector, a heated capillary tube pressure release restrictor, has a thermally insulated outlet end in a collecting trap substantially colder than the capillary tube. The restrictor is h... | 08/05/1997 |
