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. 16, 1984
Filed:
Jul. 28, 1982
Applicant:
Inventors:
Hideaki Oba, Yokohama, JP;
Makoto Kunikane, Chigasaki, JP;
Masaakira Umehara, Yokohama, JP;
Kiyoshi Tanikawa, Yokohama, JP;
Michiharu Abe, Yokohama, JP;
Assignee:
Ricoh Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03C / ;
U.S. Cl.
CPC ...
430273 ; 430945 ; 430942 ; 430296 ; 430275 ; 430276 ; 430277 ; 430278 ; 430279 ; 430524 ; 430525 ; 430526 ; 430271 ; 3461351 ; 346 / ;
Abstract
An optical information recording medium comprising a substrate and a recording layer superimposed on said substrate, said recording layer comprising a reflective layer in which metal particles with a particle diameter of 1500.ANG. or less have been distributed closely and a light absorptive layer in which metal compounds and a very small amount of metal particles with a particle diameter of 200-2000.ANG. have been dispersed unformly or substantially uniformly in the volume ratio of 1-30% in a resin.