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:
Jun. 24, 1997
Filed:
Apr. 20, 1995
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
A method of forming a disk brake pad having a friction member composed of a bonding layer having a low porosity and a matrix layer having a high porosity and laminated on the bonding layer. The method does not require a pre-forming step. A material formed by pelletizing a mixture of components for the friction member and a non-pelletized material are fed one after the other into a cavity defined by a mold and a back plate. Also, since the pelletized material is compacted beforehand, the bonding layer formed from the pelletized material exhibits a sufficiently low porosity, so that the bonding layer can prevent moisture from infiltrating therethrough. Thus, the back plate is less likely to develop rust. Also, the bonding strength between the back plate and the bonding layer is improved. Further, since pelletized material forming the bonding layer penetrates into the matrix layer in a complicated manner, the bond strength between the bonding layer and the matrix is also improved.