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:
Oct. 18, 2011
Filed:
Feb. 21, 2008
Toru Noguchi, Ueda, JP;
Hiroyuki Ueki, Ueda, JP;
Takumi Sagou, Nagano, JP;
Takushi Matsushita, Konosu, JP;
Tsuyoshi Watanabe, Ina-machi, JP;
Toru Noguchi, Ueda, JP;
Hiroyuki Ueki, Ueda, JP;
Takumi Sagou, Nagano, JP;
Takushi Matsushita, Konosu, JP;
Tsuyoshi Watanabe, Ina-machi, JP;
Nissin Kogyo Co., Ltd., Nagano, JP;
Fukoku Co., Ltd., Saitama, JP;
Abstract
The piston seal member is formed of a crosslinked rubber composition, the rubber composition including 100 parts by weight of an ethylene-propylene rubber, 20 to 60 parts by weight of a first carbon black, 50 to 100 parts by weight of a second carbon black, and 5 to 20 parts by weight of carbon nanofiber having an average diameter of 0.5 to 500 nm, the total amount of the first carbon black and the second carbon black being 70 to 160 parts by weight. The first carbon black has an average particle diameter of 35 to 100 nm and a DBP absorption of 50 to 200 ml/100 g. The second carbon black has an average particle diameter that is greater than the average particle diameter of the first carbon black and ranges from 60 to 500 nm and a DBP absorption of 5 to 50 ml/100 g.