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. 29, 1987
Filed:
Feb. 27, 1985
Applicant:
Inventors:
Michiharu Abe, Yokohama, JP;
Masaakira Umehara, Yokohama, JP;
Tsutomu Sato, Yokohama, JP;
Hideaki Oba, Yokohama, JP;
Yutaka Ueda, Yokohama, JP;
Makoto Kunikane, Chigasaki, JP;
Assignee:
Ricoh Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03C / ; G01D / ; G01D / ;
U.S. Cl.
CPC ...
430495 ; 430945 ; 346 / ; 3461351 ;
Abstract
This invention relates to an optical information recording medium, characterized in that on a substrate there is applied a coloring matter film chemically inert to said substrate, said coloring matter film having an extinction coefficient of at least 1.