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. 23, 1990
Filed:
Sep. 08, 1988
Applicant:
Inventors:
Tsuyoshi Santoh, Yokohama, JP;
Chieko Hioki, Kawasaki, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ; G11B / ; G03C / ;
U.S. Cl.
CPC ...
430495 ; 430270 ; 430945 ; 3461351 ;
Abstract
An optical recording medium comprising a recording layer containing at least one compound selected from the group consisting of azulenium salt compounds represented respectively by Formulae (I), (II), (III) and (IV), and an optical recording method comprising forming pits and recording information by irradiation of a laser beam on an optical recording medium having a recording layer containing one or more of azulenium salt represented by Formulae (I), (II), (III) and (IV).