Liquid purification or separation – With means to add treating material – Chromatography
Reexamination Certificate
2006-11-28
2006-11-28
Therkorn, Ernest G. (Department: 1723)
Liquid purification or separation
With means to add treating material
Chromatography
C210S101000, C210S143000, C210S656000
Reexamination Certificate
active
07141161
ABSTRACT:
A gradient pump apparatus which is capable of continuously and precisely feeding, to a chromatograph, eluents at intervals of certain time and at a constant flow rate in units of nano-liter per minute while the composition of two or more eluent components is changed. The gradient pump apparatus includes a 10-port valve for switching an eluent mixing pipe, in which a feed pressure of eluents changes with time, to be connected to a first loop which is supplied with another eluent from an isocratic pump that should function to hold an eluent feed pressure constant, and which is connected to an analytic section, or to a second loop through which the eluents are drained. A controller computes a difference between a value of the pressure in the eluent mixing pipe and a value of the eluent feed pressure applied from the isocratic pump when the eluent mixing pipe is connected to the second loop. At the time when the eluent mixing pipe is connected to the first loop with shift of the 10-port valve, the feed speed of the isocratic pump is determined based on the above pressure difference. The isocratic pump is controlled in sync with the valve shift so that the determined feed speed of the isocratic pump is obtained.
REFERENCES:
patent: 5393434 (1995-02-01), Hutchins et al.
patent: 2005/0016263 (2005-01-01), Yamauchi et al.
patent: 2006/0000759 (2006-01-01), Takao et al.
patent: 2445939 (2002-12-01), None
patent: 2002-71657 (2002-03-01), None
patent: 2002-365272 (2002-12-01), None
patent: 2003-98166 (2003-04-01), None
PTO Translation 2006-3696 of Japan Patent No. 2002-71657 Apr. 2006.
PTO Translation 2006-3692 of Japan Patent No. 2003-98166a.
Dickstein & Shapiro LLP
Hitachi High-Technologies Corporation
Therkorn Ernest G.
LandOfFree
Gradient pump apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Gradient pump apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gradient pump apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3625098