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US 4,307,156 AGranted
Magnetic record member
AssigneeNippon Electric Co., Ltd.
InventorMasahiro Yanagisawa
Life of this patent
Estimating the term…
Abstract
An improved magnetic record member having a nonmagnetic disk base with a mirrored surface, a magnetic-metal thin-film medium formed on the disk base; an intermediate layer composed of an oxide of a magnetic metal, a chromium oxide, or a phosphate formed on the film medium; and a layer of polysilicate or a metal alcoxide hydrolysis polymer formed on the intermediate layer.
Claims28
A magnetic record member comprising:
- a nonmagnetic disk base polished to have a mirror surface;
- a magnetic-metal thin film medium formed on the mirror surface of said disk base;
- an intermediate layer formed on said film medium, said intermediate layer being of a material chosen from the group consisting of an oxide of a magnetic-metal, a chromium oxide, a phosphate, and mixtures thereof;
- and
- at least one layer of an inorganic polymer formed on said intermediate layer, said inorganic polymer being of a material chosen from the group consisting of a polysilicate, a hydrolysis polymer of a metal alkoxide and mixtures thereof.
2 more elements
Dependencies are inferred from the claim text.