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:
Jul. 08, 2008
Filed:
Aug. 04, 2004
Applicants:
Richard W. Andrews, Rehoboth, MA (US);
Hal Richardson, Westborough, MA (US);
Inventors:
Richard W. Andrews, Rehoboth, MA (US);
Hal Richardson, Westborough, MA (US);
Assignee:
Waters Investments Limited, New Castle, DE (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
B01D 15/08 (2006.01);
U.S. Cl.
CPC ...
Abstract
Gradient performance with high pressure gradient solvent delivery system is optimized by approximation of infinite stroke volume of high pressure pumps by the addition of pulse dampening with backflow prevention to each high pressure pump. The backflow prevention adds sufficient minimum flow resistance, thereby enhancing the performance of the pulse dampening over a wider range of flow rates resulting in consistent gradient performance.