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:
May. 11, 2021
Filed:
Mar. 02, 2017
Applicant:
Nippon Carbon Co., Ltd., Tokyo, JP;
Inventors:
Toyohiko Kayama, Kokubunji, JP;
Tatsuya Tanii, Toyama, JP;
Assignee:
NIPPON CARBON CO., LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16J 15/10 (2006.01); F16K 5/06 (2006.01);
U.S. Cl.
CPC ...
F16K 5/0689 (2013.01); F16J 15/106 (2013.01);
Abstract
A ball valve seat in which a resin or metal impregnated graphite seal ring and an L-shaped metal retainer are integrated by a shrink fit method. The graphite seal ring is provided with a continuous rib having a height of 50 to 250 μm on the outer periphery of the graphite seal ring. The rib preferably has arc curve of radius R slopes on both sides of the rib from the top to the bottom, and the width L of the bottom of the rib is preferably 550 to 1100 μm.