The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 09, 2011
Filed:
Oct. 06, 2009
Hans-georg Weissgerber, Waldbronn, DE;
Hans-Georg Weissgerber, Waldbronn, DE;
Agilent Technologies, Inc., Santa Clara, CA (US);
Abstract
A liquid chromatograph includes a mobile phase supplying apparatus including liquid-feeding pumps to feed mobile phases, liquid-feeding flow paths, a mixer to mix the mobile phases, at least one control device to control each liquid-feeding pump, flow rate measuring sections provided downstream in each liquid-feeding flow path configured to measure an actual flow rate and to detect a back-flow, and actual flow rate computing sections configured to compute an actual flow rate in the corresponding liquid feeding flow path. Also included are a sample injecting section downstream of the mobile phase supplying apparatus, a separating column for separating an injected sample into its constituents, and a detector for detecting each of the separated constituents. When one of the actual flow rate measuring sections detects a back-flow, the corresponding actual flow-rate computing section computes an actual back-flow rate and outputs a signal to the corresponding control device to cancel the back-flow.