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:
Sep. 28, 1993
Filed:
Sep. 11, 1990
Applicant:
Inventors:
Kyo Miura, Yokohama, JP;
Hisaaki Kawade, Atsugi, JP;
Keiko Ikoma, Yokohama, JP;
Yoshihiro Oguchi, Kawasaki, JP;
Masashi Miyagawa, Yokohama, JP;
Mizuho Hiraoka, Kawasaki, JP;
Hitoshi Yoshino, Tokyo, JP;
Kazumi Nagano, Fujisawa, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03C / ; G11B / ;
U.S. Cl.
CPC ...
430270 ; 430273 ; 430495 ; 430945 ; 369100 ; 369109 ; 3692751 ; 3692753 ; 369284 ; 346 / ; 3461351 ;
Abstract
An optical card comprises a transparent substrate having a track groove on its surface, an optical recording layer provided on said track groove, and an opaque card substrate provided in such a manner that it may be contiguous to said optical recording layer, wherein an unrecordable part is provided at an end of said track groove formed on the surface of the transparent substrate.