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:
Jan. 23, 1990
Filed:
Dec. 02, 1987
Hiroshi Asano, Hyogo, JP;
Kouichi Iwata, Hyogo, JP;
Nippondenso Co., Ltd., Kariya, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
A friction material composite especially suitable for an electromagnetic clutch, includes a reinforcing fiber material, optionally an organic filler, an inorganic filler, and a friction and abrasion conditioner bonded together by a thermosetting resin binder. The reinforcing fiber material contains 25 to 35 percent by volume of staple cellulose pulp of not more than 150 .mu.m in fiber length. The organic filler contains 30 to 40 percent by weight of an organic filler material of not more than 840 .mu.m in maximum grain size. The friction and abrasion conditioner contains and 0.5 to 5 percent by volume of aluminum oxide and/or magnesium oxide of not more than 250 .mu.m in maximum grain size. The material composite has a porosity in the range of 15 to 30 percent by volume.