Liquid delivery device, liquid chromatograph, and method for...

Details Liquid delivery device, liquid chromatograph, and method for... Liquid delivery device, liquid chromatograph, and method for...

2008-08-14

2010-12-14

Therkorn, Ernest G (Department: 1797)

Liquid purification or separation

With means to add treating material

Chromatography

C210S101000, C210S656000, C417S005000, C417S022000

Reexamination Certificate

active

07850844

ABSTRACT:
The present invention provides a liquid delivery device for liquid chromatographs which, by performing liquid delivery at an accurate flow rate with limited pulsation, gives accurate results of analyses. The present invention, with a view to preventing erroneous operation due to errors in measurements at the time of judgment of completion of compression of liquid, establishes the judgment point before the pressure measured by a cylinder pressure detector agrees with the pressure measured by a discharge pressure detector and also calculates the point of completion of compression. Control in this manner prevents pressure fluctuation. It also calculates for control the point of completion of compression from the history of compression performed previously.

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patent: 2005/0084386 (2005-04-01), Mori et al.
patent: 2009/0090173 (2009-04-01), Fukuda et al.
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Japanese Office Action issued in Japanese Patent Application No. JP 2007-221372 dated Oct. 6, 2009.

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