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. 09, 2026
Filed:
Feb. 28, 2023
Hitachi High-tech Corporation, Tokyo, JP;
Shunsuke Kawabe, Tokyo, JP;
Nobuhiro Tsukada, Tokyo, JP;
Masuyuki Sugiyama, Tokyo, JP;
Yushi Harada, Tokyo, JP;
Daisuke Kanai, Tokyo, JP;
HITACHI HIGH-TECH CORPORATION, Tokyo, JP;
Abstract
Provided is a controller of a liquid feeding pump configured to: calculate a first amount of compression of a solvent by a first plunger in one driving cycle based on a compression rate parameter and control the first plunger to compress the solvent by the first compression amount in the driving cycle; when a value relating to a pressure value measured by the pressure sensor is below a threshold in the driving cycle, change the compression rate parameter according to the pressure value, and calculate a second amount of compression of the solvent by the first plunger in a subsequent driving cycle, based on the changed compression rate parameter; and when the value relating to the pressure value exceeds the threshold in the driving cycle, calculate a third amount of compression of the solvent by the first plunger in the subsequent driving cycle, based on the original compression rate parameter.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile