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. 11, 1992
Filed:
Mar. 06, 1990
Applicant:
Inventors:
Yasuo Kamitsuma, Mito, JP;
Isao Ishi, Taga, JP;
Yusaku Nakagawa, Hitachi, JP;
Noriyuki Ohnaka, Katsuta, JP;
Tadashi Iizuka, Ashikaga, JP;
Kazushi Fukuda, Tochigi, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F04C / ; F04C / ; C04B / ;
U.S. Cl.
CPC ...
418178 ; 252 122 ; 92223 ; 418179 ; 148 166 ; 4283077 ;
Abstract
A sliding structure such as a compressor and etc. comprising a member made of an iron base material and another member having a porous ceramic layer slidably contacted with the iron base member, wherein the surface portion of the iron base member has both a porous oxide film containing tri-iron tetroxide as a main constituent, and an oxynitride layer formed under the oxide film.