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. 16, 1987
Filed:
Jun. 05, 1985
Sumitomo Bakelite Company Limited, Tokyo, JP;
Abstract
A composite substrate plate for a magnetic or optical disk, comprising a metal plate, an undercoat resin layer formed on one side or both sides of said metal plate, and a surface resin layer having a mirrorlike surface formed on said undercoat resin layer. Such a composite substrate plate is obtained by placing a liquid resin for forming the surface resin layer on the undercoat resin layer formed on one side or both sides of said metal plate or, alternatively, on one or two mirror-finished surfaces of molding plates for imparting a mirrorlike surface to said surface resin layer, then assembling the metal plate and the one or two molding plates so that one side or both sides of said metal plate carrying the undercoat resin layer and the liquid resin may be brought into contact with the one or two clean mirrorlike surfaces of molding plates or, alternatively, one side or both sides of said metal plate carrying the undercoat resin layer and no liquid resin may be brought into contact with the one or two liquid resin-bearing surfaces of molding plates, subsequently allowing the liquid resin to cure, and removing the one or two mirror-finished molding plates.