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:
Mar. 19, 1985
Filed:
Jun. 07, 1983
Applicant:
Inventor:
Osamu Hirakawa, Saitama, JP;
Assignee:
Nippon Piston Ring Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
F16J / ; F16J / ;
U.S. Cl.
CPC ...
277 961 ; 277 962 ; 277204 ; 277224 ; 277D / ;
Abstract
A rotary seal improved in quality by providing relatively movable seal surfaces in the form of a hardened, wear resistant layer covering only a part of the seal body surface. In particular the hardened layer may be formed in a helical fashion such that upon relative rotation of the seal surfaces, entering abrasives and the like may be shunted to the outside periphery of the seal, per se.