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. 25, 1997
Filed:
Jun. 02, 1995
Russell E Hite, Richmond, IN (US);
Ihor R Maksymiak, Toledo, OH (US);
Michael A Kestner, Richmond, IN (US);
Dana Corporation, Toledo, OH (US);
Abstract
A base body of a piston ring has an electroplated chrome or gas nitrided sub-layer formed on its outer peripheral face. The sub-layer is face-lapped, roughened through grit blasting, and then oil lapped to remove the asperities. The resulting plateau-reservoir surface has a smooth plateau and a number of reservoirs. A metallic nitride face coating is applied to the sub-layer. The reservoirs provide additional surface area to promote the bonding between the metallic nitride and the sub-layer. The coating does not eliminate the reservoirs, however. Thus, the reservoirs provide the additional function of storing lubricating oil which may be used during piston ring operation to eliminated unwanted wear.