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:
Dec. 20, 2016
Filed:
Nov. 11, 2010
Coordinating injector-valve switching with pump-stroke timing to mitigate effects of pressure pulses
John Heden, Hollis, NH (US);
John Lamoureux, Franklin, MA (US);
Miguel Soares, Norton, MA (US);
Guo-zhong LI, Westborough, MA (US);
John Heden, Hollis, NH (US);
John Lamoureux, Franklin, MA (US);
Miguel Soares, Norton, MA (US);
Guo-Zhong Li, Westborough, MA (US);
WATERS TECHNOLOGIES CORPORATION, Milford, MA (US);
Abstract
A liquid chromatography system includes an autosampler with an injector valve by which a sample at low pressure within a sample loop is introduced into a high-pressure solvent mixture stream. A solvent delivery system includes a pump in fluidic communication with the injector valve of the autosampler to deliver the solvent mixture stream thereto. The solvent delivery system further comprises a processor that calculates a number of strokes of the pump needed to deliver the solvent mixture stream to the injector valve of the autosampler. The processor counts strokes of the pump during delivery of the solvent mixture stream. In response to a stroke count equaling the calculated number of strokes, the processor signals the autosampler to switch the injector valve to introduce the sample to the solvent mixture stream during a pump transfer period within which the pump performs pressure control to compensate for a drop in pressure.