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:
May. 23, 2006
Filed:
Feb. 21, 2003
François Couillard, 56860 Sene, FR;
Daniel Durand, Rueil Malmaison, FR;
François Couillard, 56860 Sene, FR;
Daniel Durand, Rueil Malmaison, FR;
Institut Francais du Petrole, Rueil-Malmaison Cedex, FR;
Other;
Abstract
A method and system is intended for fine proportioning of fluids injected into a pumping installation, e.g., a liquid chromatography installation, allowing to compensate for non-return valve errors. The system includes a fluid delivery system including vessels for constituents (A, B, X) that communicate with a pumping unit () by means of a one-way valve () that opens upon suction, and a control unit (PC) that adjusts the respective proportions of the various fluids sucked by acting on the opening time of solenoid valves (EVto Even) associated with the various vessels. As the opening and closing times of the one-way valve are most often unequal in practice, control unit (PC) is suited to cyclically change the order of the control signals applied to the various solenoid valves during the various successive suction stages of each pumping unit so as to compensate on average for the proportioning inequalities due to each one-way valve.