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. 14, 1999
Filed:
Jun. 17, 1997
Applicant:
Inventors:
Hiroshi Matsunaga, Kusatsu, JP;
Shigeru Muramatsu, Kusatsu, JP;
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F04C / ;
U.S. Cl.
CPC ...
418 63 ; 418178 ; 295272 ; 29888025 ;
Abstract
A tip of a vane slid with a rolling piston is mechanically finish-ground in the direction of the sliding movement between the vane and the rolling piston, and provided with a protective coating film being proof against abrasion which is composed of non-ferrous metal formed by a physical vapor deposition method, or composed of a chromium nitride compound formed by an ion plating method. Hydrofluorocarbon is employed as a refrigerant, and ester oil being compatible with the refrigerant is used as a lubricating oil.