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:
Jul. 18, 1989
Filed:
Apr. 25, 1988
Masatoshi Tanaka, Osaka, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
A method for manufacturing an electric resistance element first prepares carbon particles by thermally treating these particles, such as carbon black at a temperature of at least 300.degree. C. Then a separate mixture of the carbon particles in an epoxy resin is prepared by mixing the carbon particles with a solution of an amino resin to at least partially cause adsorption, occlusion or reaction between the carbon particles and the amino resin. Then the amino resin is polymerized by heating. A further mixture is prepared by mixing a solution of epoxy resin with the first mixture to prepare a paste material which is then coated onto the surface of a substrate. The coating is then thermally cure to form a resistance film on the surface of the substrate.