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:
Dec. 22, 1981
Filed:
Aug. 29, 1980
Naoaki Ohishi, Machida, JP;
Toshiaki Sakaida, Shiojiri, JP;
Mitsuru Hasegawa, Shiojiri, JP;
Iwao Hiramatsu, Shiojiri, JP;
Showa Denko Kabushiki Kaisha, Tokyo, JP;
Abstract
In the manufacture of a wiring board, or a heat discharge plates and the like in the field of the electronics, composite materials consisting of substrates and organic polymeric materials and epoxy resin, as well as ceramic materials such as alumina plates, have heretofore been used as substrates of printed wiring boards and heat sinks. These substrate materials, however, are defective in that, because of a low thermal conductivity and an insufficient heat radiation. A highly thermal conductive and electrical insulating substrate of the invention comprises a highly thermal conductive metal plate, such as aluminum, and a film formed thereon, said film being composed of a dispersion of metal oxide particles having a shape factor, of 1 to 1.4, and also, having a polyhedral shape including smooth surfaces in an adhesive organic polymer. The space factor is an average value of the long diameter/short diameter ratio of the metal oxide particles.