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:
Sep. 15, 2009
Filed:
Oct. 30, 2003
Kunihiko Takao, Tsuchiura, JP;
Kenji Hiraku, Chiyoda, JP;
Isao Hayase, Tsuchiura, JP;
Hironori Kaji, Hitachinaka, JP;
Masahito Ito, Hitachinaka, JP;
Kunihiko Takao, Tsuchiura, JP;
Kenji Hiraku, Chiyoda, JP;
Isao Hayase, Tsuchiura, JP;
Hironori Kaji, Hitachinaka, JP;
Masahito Ito, Hitachinaka, JP;
Hitachi High-Technologies Corporation, Tokyo, JP;
Abstract
Provided is a liquid chromatograph pump system which sucks eluent from an eluent reserving container, and which feeds pressurized high pressure eluent into a column, wherein a plunger reciprocating in a cylinder is formed on its outer peripheral surface with a stepped part along the sliding direction of the plunger in the cylinder so as to define a working chamber between the stepper part and the inner wall surface of the cylinder, the flow rate of the liquid chromatograph pump being determined by the volume of the working chamber and the traveling speed of the plunger, thereby it is possible to stably feed a liquid at an extremely low flow rate, and to satisfactorily expel air bubbles upon a start of the liquid chromatograph pump system.