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:
Sep. 30, 1980
Filed:
Jun. 07, 1978
Applicant:
Inventors:
Seiichi Kakuwa, Hiroshima, JP;
Toshihiko Hattori, Hiroshima, JP;
Ichiro Yamagata, Hiroshima, JP;
Toshio Yamada, Hiroshima, JP;
Assignee:
Toyo Kogyo Co., Ltd., Hiroshima, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F01C / ; F01C / ;
U.S. Cl.
CPC ...
418142 ; 418178 ; 418179 ; 2915 / ;
Abstract
The side housing of a rotary piston engine has an inner surface which has been subjected to a soft-nitriding treatment to form a layer of Fe-C-N type compounds and thereafter ground to provide a surface roughness of between 0.3 and 15 microns. An oil seal which slidably engages the inner surface of the side housing has a sealing lip constituted by a chromium plating. The arrangement provides an improved wear resistance of the oil seal.
Kakuwa, Seiichi. (1980). Oil seal means for rotary piston engines including a nitrided and ground (U.S. Patent No. 4225294). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4225294
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile