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:
Jun. 05, 2012
Filed:
Jan. 26, 2009
Naoya Yasuhara, Hitachinaka, JP;
Hironori Kaji, Hitachinaka, JP;
Kimihiko Ishii, Hitachinaka, JP;
Hiroyuki Wada, Hitachinaka, JP;
Naoya Yasuhara, Hitachinaka, JP;
Hironori Kaji, Hitachinaka, JP;
Kimihiko Ishii, Hitachinaka, JP;
Hiroyuki Wada, Hitachinaka, JP;
Hitachi High-Technologies Corporation, Tokyo, JP;
Abstract
Disclosed herein is a stable solvent delivery device capable of delivering solvent both at high pressure and at constant flow rate. A solvent delivery device comprises a plurality of plungers which reciprocate in the respective pump chambers including an eluent charge side pump chamber and an eluent discharge side pump chamber, a motor to reciprocate these plungers, a control unit to control the operation of the motor, valves which are respectively set at the eluent inlet and outlet of the eluent charge side pump chamber, a first sensor to measure the quantity of load received by the plunger in the eluent charge side pump chamber, and a second sensor to measure the pressure of the eluent discharged from the eluent discharge side pump chamber.