Pumps – With condition responsive pumped fluid control – Fluid flow rate responsive
Reexamination Certificate
2006-05-23
2006-05-23
Thorpe, Timothy S. (Department: 3746)
Pumps
With condition responsive pumped fluid control
Fluid flow rate responsive
C417S053000, C417S286000, C417S287000, C073S023420, C073S061560, C073S023410
Reexamination Certificate
active
07048517
ABSTRACT:
The invention is a device and method in a high-pressure chromatography system, such as a supercritical fluid chromatography (SFC) system, that uses a pump as a pressure source for precision pumping of a compressible fluid. The preferred exemplary embodiment comprises a pressure regulation assembly installed downstream from a compressible fluid pump but prior to combining the compressible flow with a relatively incompressible modifier flow stream. The present invention allows the replacement of an high-grade SFC pump in the compressible fluid flow stream with an inexpensive and imprecise pump. The imprecise pump becomes capable of moving the compressible fluid flow stream in a precise flow rate and pattern. The assembly dampens the damaging effects of an imprecise pump, such as large pressure oscillations caused by flow ripples and noisy pressure signals that do not meet precise SFC pumping requirements.
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Bente, III Paul F.
Berger Terry A.
Fogelman Kimber D.
Klein Kenneth
Nickerson Mark
Mettler-Toledo AutoChem, Inc.
Sayoc Emmanuel
Sheets Kendal M.
Thorpe Timothy S.
Zito Joseph J.
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