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:
May. 25, 1993
Filed:
Mar. 05, 1991
Applicant:
Inventors:
Yutaka Ueda, Yokohama, JP;
Eiji Noda, Kawasaki, JP;
Assignee:
Ricoh Company, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ; G03C / ;
U.S. Cl.
CPC ...
430271 ; 430495 ; 430945 ; 428 64 ; 428 65 ; 522 96 ;
Abstract
An optical recording medium comprising a pair of concentrically-positioned disk-shaped polycarbonate substrates with a recording layer on a single surface of at least one of these substrates, wherein the substratcs are formed into a sealed configuration with the recording layer on the inside, either with or without an inner peripheral spacer and an outer peripheral spacer, using an adhesive which comprises a compound of formula (I), a compound of formula (II)-A or (II)-B, and a compound of formula (III) as specified in the specification.