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. 11, 2011
Filed:
Jun. 20, 2008
Mitsuo Unno, Hitachi, JP;
Kazuya Baba, Hitachi, JP;
Mitsuo Unno, Hitachi, JP;
Kazuya Baba, Hitachi, JP;
Hitachi Chemical Co., Ltd., Tokyo, JP;
Abstract
Disclosed is a friction material composition, comprising a fiber matrix, a binder, an organic filler, and an inorganic filler, wherein the fiber matrix contains at least two types of mineral fibers different in average fiber length from each other, and the difference between the minimum value and the maximum value among the average fiber lengths of the mineral fibers is 50 μm or more. Also disclosed is a friction material produced by pressure-molding the friction material composition while heating. Further disclosed is a friction material having an underlayer material interposed between a friction surface and a back metal, while the underlayer material is produced by pressure-molding the friction material composition while heating.