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:
Feb. 20, 2024
Filed:
Nov. 08, 2018
Applicant:
Shimadzu Corporation, Kyoto, JP;
Inventors:
Assignee:
Shimadzu Corporation, Kyoto, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F04B 53/02 (2006.01); F04B 53/14 (2006.01); F04B 53/16 (2006.01); F04B 17/00 (2006.01); F04B 19/22 (2006.01);
U.S. Cl.
CPC ...
F04B 53/143 (2013.01); F04B 17/00 (2013.01); F04B 19/22 (2013.01); F04B 53/02 (2013.01); F04B 53/162 (2013.01);
Abstract
A backup ring is for contacting with and supporting a plunger seal which is for sealing a pump chamber provided in a pump head of a plunger type liquid feeding pump. The backup ring includes a maximum outer diameter portion of a cylindrical shape and a smaller outer diameter portion. The maximum outer diameter portion includes a maximum outer diameter in a plunger seal supporting surface side that makes contact with a rear surface of the plunger seal. The smaller outer diameter portion includes a smaller outer diameter than the maximum outer diameter portion in at least one part of a portion other than the maximum outer diameter portion.