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:
Nov. 26, 2013
Filed:
Mar. 03, 2009
Junpei Ogawa, Machida, JP;
Takaaki Kondou, Yokohama, JP;
Tomonori Miyazawa, Chigasaki, JP;
Toyoki Iguchi, Yokohama, JP;
Takuma Suzuki, Kawasaki, JP;
Takeshi Makita, Saitama, JP;
Katsuaki Ogawa, Saitama, JP;
Takahiro Okazaki, Saitama, JP;
Junpei Ogawa, Machida, JP;
Takaaki Kondou, Yokohama, JP;
Tomonori Miyazawa, Chigasaki, JP;
Toyoki Iguchi, Yokohama, JP;
Takuma Suzuki, Kawasaki, JP;
Takeshi Makita, Saitama, JP;
Katsuaki Ogawa, Saitama, JP;
Takahiro Okazaki, Saitama, JP;
Nissan Motor Co., Ltd., Yokohama-shi, JP;
Nippon Piston Ring Co., Ltd., Saitama-shi, JP;
Abstract
A piston ring includes: a refined steel including: carbon C in a range of 0.20% mass to 0.90% mass, silicon Si in a range of 0.10% mass to less than 0.60% mass, manganese Mn in a range of 0.20% mass to 1.50% mass, chromium Cr in a range of 0.30% mass to 2.00% mass, and a remnant including: iron Fe, and an unavoidable impurity. A parameter A calculated from the following expression (1) based on contents of the Si, Mn and Cr is 9.0 or less: parameter A=8.8 Si+1.6 Mn+1.7 Cr—expression (1). A parameter B calculated from the following expression (2) based on contents of the C, Si, Mn and Cr is 10.8 or more: parameter B=36 C+4.2 Si+3.8 Mn+4.5 Cr—expression (2).