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:
Dec. 03, 2024
Filed:
Dec. 02, 2019
Hitachi High-tech Corporation, Tokyo, JP;
Ayano Otsubo, Tokyo, JP;
Hisao Inami, Tokyo, JP;
Nobuhiro Tsukada, Tokyo, JP;
Daisuke Akieda, Tokyo, JP;
Kenichiro Nishiki, Tokyo, JP;
Yoshihiro Nagaoka, Tokyo, JP;
HITACHI HIGH-TECH CORPORATION, Tokyo, JP;
Abstract
A liquid chromatograph has a long-life flow passage switching valve with reduced abrasion caused by sliding of flow passage end portions of a stator and flow passage end portions of a rotor seal. The flow passage switching valve includes: a stator; and a rotor seal connected with a rotor configured to rotate and slide on a circumference with respect to the stator. The stator has stator flow passages that open to the rotor seal. The rotor seal has a rotor seal flow passage for coupling two or more of the stator flow passages. A flow passage end portion that is positioned at a tip end in a sliding direction of the rotor seal flow passage is positioned in a direction opposite to the sliding direction of the stator flow passage end portion to be connected to the rotor seal flow passage, at least at the start of sliding.