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:
Aug. 02, 1988
Filed:
Mar. 12, 1981
Takashi Shima, Tokyo, JP;
Katuro Takasawa, Saitama, JP;
Tomoharu Ashikawa, Kanagawa, JP;
Taro Tsujimura, Tokyo, JP;
Yasuo Takenaka, Kanagawa, JP;
Shunichi Tomizuka, Hokkaido, JP;
The Japan Steel Works, Ltd., Tokyo, JP;
Japanese National Railways, Tokyo, JP;
Abstract
A composite metal material for a friction brake composed of a sliding friction surface metal layer of grey cast iron and a layer of a high strength different metal having a crack transmission resistance. The grey cast iron and high strength different metal are metallurgically bonded together. In this composition metal material, cracks formed in the sliding friction surface metal layer are prevented from spreading by the high strength different metal having a high crack transmission resistance. An intermediate metal layer may be provided if desired.