Did You Know...
...that when IBM conducted a market study of Chester Carlson's invention in 1959, the company concluded that it would take only 5000 units of his new product to saturate the market? IBM therefore declined to be part of the new product introduction. Too bad for IBM. Carlson's invention was the xerography process, and his new product was the beginning of the Xerox Corporation. It is estimated that every day, worldwide, 3,000,000,000 copies are made!!
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| Number | Title | Issue Date |
| 7437906 | Flow regulator device for an analytical circuit and its use in chromatography A flow regulator device for an analytical circuit, characterised by comprising: a fluid restriction (R) of defined characteristics related to the field of application of the analytical circuit, a direct-pressure regulator (2) positioned upstream of said restr... | 10/21/2008 |
| 7360434 | Apparatus and method to measure air pressure within a turbine airfoil A pressure tap probe having a flexible probe tip that is flexible enough to seal a film cooling hole having a roughened surface such as a TBC applied around the hole. The flexible probe tip is flexible enough to deform around the film cooling hole such that an accur... | 04/22/2008 |
| 7350536 | Vacuumized receptacle for sample collection A portable receptacle is vacuumized for use in taking an air or gas sample for subsequent examination to determine type, origin, components of the air or gas. Critical to a long shelf life of the vacuumized receptacle is a valve which virtually seals the receptacle ... | 04/01/2008 |
| 7348526 | Microwave-assisted chromatography preparation An instrument and associated method are disclosed for preparing samples for column chromatography. The method includes the steps of applying microwave energy to a sample composition containing at least one solvent to encourage a chemical reaction and generate desire... | 03/25/2008 |
| 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 |
| 7225085 | Precision gas flow meter A precision gas flow meter that is capable of measuring small flow rates of gasses precisely in the range of 0.01 to 10 L per minute. The meter is designed to measure the gas flow in small volume increments of predetermined value, and therefore can be used to measur... | 05/29/2007 |
| 7219532 | System for regulating fluid flowing through chromatographic column Disclosed are systems and methods that include a sampling device, a chromatographic column, and a transfer line through which a fluid containing analytes to be measured are communicated from the sampling device to the column. The pressure at which the fluid containi... | 05/22/2007 |
| 7207224 | Wide-range combination vacuum gauge A combination vacuum gauge provides simultaneous absolute and differential pressure measurements over a wide range of pressures ranging from atmospheric pressures to ultrahigh vacuum by processing the readings from an absolute high vacuum gauge (e.g., an ionization ... | 04/24/2007 |
| 7145467 | Medical gas alarm system A medical gas alarm system for use in a healthcare facility having a medical gas system and having a network of computer devices is provided. The alarm system includes at least one area alarm controller adapted to receive a first signal indicative of a condition of ... | 12/05/2006 |
| 7111494 | 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 ... | 09/26/2006 |
| 7078706 | Chamber, exposure apparatus, and device manufacturing method Disclosed is a chamber having a static-pressure bearing disposed therein, the chamber including an inside pressure gauge for detecting an inside pressure of said chamber, and a pressure controller for decreasing the inside pressure of the chamber on the basis of the... | 07/18/2006 |
| 7043963 | Apparatus and method for determining evaporative emissions A sealed housing evaporative determination (SHED) apparatus and method for practically zero emission vehicles (PZEV) provides periodic sampling of ambient air within a substantially air-tight testing structure enclosing a vehicle under test. Pressure drops within th... | 05/16/2006 |
| 6987448 | Medical gas alarm system A medical gas alarm system for use in a healthcare facility having a medical gas system and having a network of computer devices is provided. The alarm system includes at least one area alarm controller adapted to receive a first signal indicative of a condition of ... | 01/17/2006 |
| 6865926 | Method and apparatus for sample analysis Methods and systems for analyzing samples, such as gas samples, are described. One method comprises providing a gas sample, increasing pressure applied to the gas sample to compress the sample to a smaller volume and provide a pneumatically focused gas sample, and a... | 03/15/2005 |
| 6813929 | Method and apparatus for monitoring fluid flow An apparatus for monitoring fluid flow within a high pressure liquid chromatography system. The apparatus includes a pump for supplying a system flow of eluent to the system, a chromatography column, a flow splitting device having a first restrictor fluidly connecti... | 11/09/2004 |
| 6779405 | Method of measuring vacuum pressure in sealed vials The present invention provides a fast and accurate method of measuring the vacuum pressure in a sealed glass vial or other electrically non-conductive vessel. In the method the vial or vessel to be tested is placed between a pair of electrodes. The gas contained wit... | 08/24/2004 |
| 6494078 | Retention-time locked comprehensive multidimensional gas chromatography A method applies retention-time locking to the retention times and/or the column(s) void times of a target analyte(s) being eluted thru a multidimensional gas chromatography system. Retention time locking is applied to both standard and comprehensive mult... | 12/17/2002 |
| 6386014 | Energy measurement device for flowing gas using microminiature gas chromatograph A system for determining the energy and volume delivered by a flowing natural gas carried within a pipeline based on BTU content analysis of the natural gas using a micro-miniature gas chromatograph. By monitoring key parameters of the flowing natural gas... | 05/14/2002 |
| 6153438 | Retention factor database A method for identifying analytes of interest by referencing to a retention factor database corresponding to a plurality of identified analytes that is independent of column dimensions and carrier gas type while dependent upon stationary phase type ratio ... | 11/28/2000 |
| 5846293 | Method for admitting and receiving samples in a gas chromatographic column A method of admitting and receiving a sample into a gas chromatographic column is provided in which a step increase in pressure is performed in combination with the application of a negative axial thermal gradient to provide pre-separation of solutes in t... | 12/08/1998 |
| 5827946 | Method for sample identification using a locked retention time database The invention provides a method for developing a retention time database of identified analytes and their respective retention times in a reference Gas Chromatograph (GC) system under locked conditions for identification of unknown analytes of interest el... | 10/27/1998 |
| 5782964 | Gas chromatography column assembly temperature control system A temperature control system (10) is provided for controlling temperature parameters in a gas chromatography column assembly (18). The temperature control system (10) includes an extended length capillary gas chromatography column member (12) which contai... | 07/21/1998 |
| 5545252 | Flow regulation in gas chromatograph A gas chromatographic system includes a column and an injector for delivering into the column a test portion of flow. The injector has an exit passage for discharging a split portion of carrier flow. A flow controller for regulating the inlet flow rate in... | 08/13/1996 |
| 5524084 | Method and apparatus for improved flow and pressure measurement and control In the preferred embodiment, the invention is embodied in the pneumatic manifold of a gas chromatograph to provide current operating temperature and pressure compensation of inlet fluid flow. The pneumatic manifold comprises a plurality of thermally coupl... | 06/04/1996 |
| 5476000 | Retention time stability in a gas chromatographic apparatus The effect of barometric pressure variation on the retention time stability of a chromatographic analytical system is compensated by active control of the amount of fluid flow by way of a fluid flow controller, preferably in the form of an electronic pres... | 12/19/1995 |
| 5428985 | Gas leak detection apparatus and methods An improved gas leak detection apparatus is disclosed for detecting a leak in a gas containing vessel of constant volume which compensates for deviations in behavior of a contained gas from an ideal model. The apparatus incorporates a pressure transducer,... | 07/04/1995 |
| 5379629 | Method and apparatus for regulating the carrier gas pressure for separation column arrangements in gas chromatography A method for stabilizing a pressure differential in a first of two successive gas chromatographic separation columns of a valveless separation column arrangement includes the step of supplying a carrier gas at a controlled pressure to an inlet and outlet ... | 01/10/1995 |
| 5235235 | Multiple-frequency acoustic wave devices for chemical sensing and materials characterization in both gas and liquid phase A chemical sensor (1) includes two or more pairs of interdigital electrodes (10) having different periodicities. Each pair is comprised of a first electrode (10a) and a second electrode (10b). The electrodes are patterned on a surface of a piezoelectric s... | 08/10/1993 |
| 5166076 | Device and method for sample dosing in gas chromatography A dosing device has a flow divider connected between a carrier gas source and a gas chromatography separating column, in particular a capillary column. The flow divider has a conduit with an opening and a chamber surrounding said conduit with a delivery l... | 11/24/1992 |
| 4512181 | Pressure compensation for a chromatograph In a chromatographic analysis, errors in the chromatographic analysis caused by barometric pressure variations are corrected by dividing the actual measured analysis (Cm) by a correction factor which is calculated based on the actual atmospheri... | 04/23/1985 |
| 4359891 | Repetitive chromatographic apparatus A repetitive gas chromatograph employing a backflush valve downstream from the detector and a separate sample injection valve located upstream located directly upstream from the single chromatographic column. Each valve is operated independently of the ot... | 11/23/1982 |
| 4271695 | Apparatus for feeding carrier gas to on-column injectors An apparatus for feeding carrier gas at a constant rate to on-column injectors for capillary and micropacked gas-chromatographic columns. The apparatus includes a constant pressure gas delivering device in operation during the sample injection, and a cons... | 06/09/1981 |
| 4196612 | Pressure regulator for a chromatograph A method and apparatus is disclosed for providing a very reproducible chromatographic analyzer output by reducing variations in the chromatographic analyzer output due to changes in barometric pressure. An absolute back pressure regulator is utilized to p... | 04/08/1980 |
| 4141237 | Pressure compensation method and apparatus for a chromatograph A method and apparatus is disclosed for correcting errors in a chromatographic analysis caused by changes in ambient atmospheric pressure. The output signal from a chromatograph is summed with the output signal from a pressure transducer. The output signa... | 02/27/1979 |
| 4123236 | Gas chromatograph device An improved high resolution chromatograph device operable at column pressures ranging between one and fifty atmospheres absolute measured at the column exit, means for closely regulating the column carrier gas velocity including intermittent stop flow ope... | 10/31/1978 |
| 4067226 | Chromatographic apparatus A gas chromatographic apparatus especially useful in analyzing low boiling materials is provided with means for flowing a pressurized liquid sample through the sampling valve, during the sampling period, in order to reduce the possibility of trapping bubb... | 01/10/1978 |
