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:
Oct. 11, 1988
Filed:
Aug. 05, 1985
Applicant:
Inventors:
Hiroshi Omata, Kawasaki, JP;
Shigeharu Iijima, Kawasaki, JP;
Eizo Sasamori, Yokohama, JP;
Katsuhiko Takano, Yokohama, JP;
Masaaki Matsushima, Yokohama, JP;
Kazuoki Honguu, Yokohama, JP;
Mitsuharu Sawamura, Yokohama, JP;
Kazuhiko Kikuchi, Kawasaki, JP;
Takahiko Ishiwatari, Nihonbashi, JP;
Hiroyoshi Kishi, Tokyo, JP;
Hisaaki Kawade, Yokohama, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
428 69 ; 428216 ; 428336 ; 428428 ; 428432 ; 428472 ; 428694 ; 428698 ; 428900 ;
Abstract
In an optical recording medium having an optical recording layer provided on a substrate, a carbide film of a substance selected from among tungsten, boron, molybdenum, hafnium, niobium, titanium, chromium, vanadium, tantalum and silicon is formed on one or each side of the recording layer.