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:
Aug. 09, 2016
Filed:
Jul. 20, 2011
Kenichiro Tokuo, Hitachinaka, JP;
Kenji Hiraku, Kasumigaura, JP;
Hironori Kaji, Hitachinaka, JP;
Daisuke Akieda, Hitachinaka, JP;
Kimihiko Ishii, Hitachinaka, JP;
Naoya Yasuhara, Hitachinaka, JP;
Kenichiro Tokuo, Hitachinaka, JP;
Kenji Hiraku, Kasumigaura, JP;
Hironori Kaji, Hitachinaka, JP;
Daisuke Akieda, Hitachinaka, JP;
Kimihiko Ishii, Hitachinaka, JP;
Naoya Yasuhara, Hitachinaka, JP;
HITACHI HIGH-TECHNOLOGIES CORPORATION, Tokyo, JP;
Abstract
A pump controller causes a first plunger pump and a second plunger pump connected in series or in parallel to perform intake and compression actions alternately at substantially constant cycles, sets a pressurizing chamber of one of the plunger pumps to a state of a higher pressure than the pressurizing chamber of the other plunger pump, and performs flow rate control by adjusting lift amounts of the first plunger and the second plunger. Thus, it is possible to provide a pump for liquid chromatograph, and a liquid chromatograph, which are capable of reducing pulsations even when an ejection flow rate is changed.