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:
Feb. 21, 1989
Filed:
Apr. 15, 1987
Applicant:
Inventors:
Seiichi Miyai, Kanagawa, JP;
Junichi Akamatsu, Saitama, JP;
Assignee:
Sony Corp., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369286 ; 369283 ;
Abstract
In an optically recordable carrier having a substrate and an optical record layer on the substrate, the optical record layer is enveloped, at all of its surfaces with a protective film of inorganic material by which the resistance to corrosion of the optical record layer is improved considerably.