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. 02, 2005
Filed:
Jun. 30, 2003
Applicants:
Kenji Hiraku, Chiyoda, JP;
Kunihiko Takao, Tsuchiura, JP;
Hironori Kaji, Hitachinaka, JP;
Masahito Ito, Hitachinaka, JP;
Inventors:
Kenji Hiraku, Chiyoda, JP;
Kunihiko Takao, Tsuchiura, JP;
Hironori Kaji, Hitachinaka, JP;
Masahito Ito, Hitachinaka, JP;
Assignee:
Hitachi High-Technologies Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D015/08 ;
U.S. Cl.
CPC ...
Abstract
In a pump for feeding a liquid for chromatography, first and second plungers form first and second volumes respectively together with first and second chambers, the first plunger is prevented from changing the first volume sufficiently for feeding the liquid between the first and second volumes when the second plunger decreases the second volume to discharge the fluid from the second volume to an outlet path of the pump for the chromatography.