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. 08, 1996
Filed:
Sep. 17, 1993
David E Gay, Noblesville, IN (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A polymeric coating material is provided for coating powdered materials, and more particularly, for coating powdered metals which are compression molded to form magnetic cores. The preferred polymeric materials are polybenzimidazole, an aromatic polyamide such as polyphthalamide, and appropriate polyimides which, when properly applied to metal particles to form a magnetic core, are characterized as having a sufficiently high heat deflection temperature of at least about 270.degree. C., so as to prevent the degradation of the mechanical and magnetic properties of the magnetic core at exposure at elevated temperatures. Each of these preferred coating materials is characterized by excellent mechanical properties, chemical resistance and dielectric characteristics within this temperature range.