Flow regulation in gas chromatograph
March 1, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3496702 Flow controller-flow sensor assembly for gas chromatographs and the like Automatic chromatography apparatus Gas chromatograph having integrated pressure programmer Decoupled flow and pressure setpoints in an extraction instrument using compressible fluids Apparatus and methods for controlling fluids provided to a chromatographic detector Pressure programmable gas chromatograph regulator Gas chromatograph and method of using same Reconfigurable pneumatic control for split/splitless injection Patent #: 5431712 InventorsAssigneeApplicationNo. 397707 filed on 03/01/1995US Classes:95/15, And pressure sensed73/23.25, Temperature73/23.27, Pressure73/23.36, With electrical computer or data processor control95/22, Gas flow rate modified95/23, Gas flow rate sensed95/82, CHROMATOGRAPHY96/102, With control means responsive to sensed condition96/103, With programmed, cyclic, or time responsive control means96/105Including injection system or inlet fluid distributorExaminersPrimary: Spitzer, RobertAttorney, Agent or FirmForeign Patent References
International ClassB01D 015/08AbstractA 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 includes a variable outlet restrictor for the split portion, a flow rate detector disposed to detect inlet flow rate, and a feedback flow controller to regulate the outlet restrictor to maintain the inlet flow rate substantially constant. Pressure at the inlet to the injector is regulated by detecting pressure at an outlet and providing feedback control to an inlet restrictor. An integral module for the gas components is used on each side of the injector. Calibration and correction for gas characteristics are provided in the feedback for a chromatographic system and for other flow controller regulation.Other References
Field of SearchFor gas chromatographyRate of flow Temperature Pressure Gas chromatography With electrical computer or data processor control Including sample preparation or sampling Temperature sensed And pressure sensed Pressure sensed Gas flow rate modified Gas flow rate sensed CHROMATOGRAPHY Liquid supported on surface of capillary column Injection, per se, without separation CHROMATOGRAPHY TYPE APPARATUS With control means responsive to sensed condition With programmed, cyclic, or time responsive control means Plural separate and distinct stages Including injection system or inlet fluid distributor | |
