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:
Apr. 08, 1980
Filed:
Oct. 26, 1978
Applicant:
Inventor:
Mitsuyoshi Matsushita, Tokyo, JP;
Assignee:
Tanken Seiko Corp., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16J / ;
U.S. Cl.
CPC ...
277 74 ; 277 75 ; 277 961 ; 277 86 ;
Abstract
A mechanical seal has a seal ring whose sealing face is divided into an inner part and an outer part by a circular groove through which sealing liquid is fed. The inner part of the sealing face is concave in the axial direction thereof.