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. 25, 1983
Filed:
Oct. 20, 1981
Aisin Seiki Kabushiki Kaisha, Kariya, JP;
Aisin Kako Kabushiki Kaisha, Kariya, JP;
Abstract
A friction material particularly useful as a clutch facing is prepared by (a) impregnating a fiber base material with a binder, said fiber being other than asbestos fiber and being stable to heat without reduction in weight and in volume in an atmosphere at 300.degree. C.; (b) shaping the impregnated fiber into the predetermined shape of a crude friction material; (c) inserting said shaped material into the cavity of a mold which has been heated to a predetermined temperature; (d) pressure/heat treating said shaped material by compressing the crude friction material for 2 to 10 seconds at a predetermined pressure and at a predetermined temperature in a closed mold and degassing the compressed friction material for 0.5 to 2 seconds in an open mold, and repeating the cycle of step (d) 10 to 20 times.