Pumps – Processes
Reexamination Certificate
2006-05-23
2006-05-23
Freay, Charles G. (Department: 3746)
Pumps
Processes
C417S298000, C222S132000, C222S145700
Reexamination Certificate
active
07048512
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 (1–11) by means of a one-way valve (8) 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 (EV1to 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.
REFERENCES:
patent: 4310420 (1982-01-01), Konishi et al.
patent: 4437812 (1984-03-01), Abu-Shumays et al.
patent: 4595495 (1986-06-01), Yotam et al.
patent: 4595496 (1986-06-01), Carson
patent: 4643649 (1987-02-01), Schmid
patent: 4797834 (1989-01-01), Honganen et al.
patent: 5755561 (1998-05-01), Couillard et al.
patent: 6116869 (2000-09-01), Couillard et al.
patent: 2821005 (1978-11-01), None
patent: 0 040 161 (1981-11-01), None
patent: 0 194 450 (1986-09-01), None
patent: 0 309 596 (1993-03-01), None
patent: 0 709 572 (1996-05-01), None
patent: 2 768 189 (1999-03-01), None
Couillard François
Durand Daniel
Couillard Francois
Freay Charles G.
Institut Francais du Pe'trole
LandOfFree
Method and system intended for fine proportioning of fluids... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and system intended for fine proportioning of fluids..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and system intended for fine proportioning of fluids... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3615403