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US 4,188,240 AGranted
Method for producing a metal layer by plating
AssigneeSony Corporation
InventorAkira Yoshio
Life of this patent
Estimating the term…
Abstract
The metallic surface of a master plate or mother plate is oxidized in a solution of hypochlorite to form a parting layer upon which a metal layer is plated. The metal layer may be stripped from the master plate or mother plate aided by the parting layer to form a matrix or stamper from which a plastic record disc, such as, a video disc, can be molded.
Claims6
A method for producing a metal layer by plating comprising the steps of:
- providing a substrate with a metallic surface to be plated;
- oxidizing said metallic surface of said substrate with hypohalogenite for sufficient time to form an oxide parting layer thereon;
- and
- plating a metallic layer on a surface of said oxide parting layer.
1 more element
A method for producing a plastic disc containing recorded information comprising:
- producing a master disc with a metallic surface and having said information defined by irregularities of said surface;
- oxidizing said metallic surface with hypohalogenite for sufficient time to form an oxide parting layer thereon;
- plating a metal layer on said oxide parting layer;
- separating said metal layer from said master disc at said parting layer;
- and
- pressing a surface of said metal layer against a plastic disc material whereby a plastic disc is formed with a surface of said plastic disc having irregularities which are a replica of said information.
3 more elements
Dependencies are inferred from the claim text.