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:
Jan. 02, 2024
Filed:
Dec. 03, 2019
Applicant:
Hitachi High-tech Corporation, Tokyo, JP;
Inventors:
Nobuhiro Tsukada, Tokyo, JP;
Daisuke Akieda, Tokyo, JP;
Shinya Ito, Tokyo, JP;
Kenichiro Nishiki, Tokyo, JP;
Assignee:
HITACHI HIGH-TECH CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F04B 1/34 (2006.01); F04B 23/06 (2006.01); F04B 49/02 (2006.01); F04B 1/02 (2006.01); F04B 49/12 (2006.01); G01N 30/32 (2006.01);
U.S. Cl.
CPC ...
F04B 1/34 (2013.01); F04B 1/02 (2013.01); F04B 23/06 (2013.01); F04B 49/02 (2013.01); F04B 49/12 (2013.01); G01N 30/32 (2013.01); F04B 2201/0201 (2013.01); F04B 2201/0206 (2013.01); G01N 2030/326 (2013.01);
Abstract
A liquid feed pump which increases the liquid flow velocity in a stagnation area in the pressure chamber of a plunger pump, thereby improving the liquid replacement speed in the plunger pump. When the liquid in the liquid feed pump is replaced, a first plunger slides back and forth in the space between a lower limit point and an upper limit point, and the second plunger stops at least temporarily at a position near to the upper limit point or slides back and forth for a shorter distance than when the liquid feed pump usually feeds the liquid.