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:
Dec. 10, 1996
Filed:
Dec. 28, 1994
Applicant:
Inventors:
Hiroyuki Minemura, Hitachi, JP;
Yoshio Sato, Hitachi, JP;
Nobuyoshi Tsuboi, Tokai-muran, JP;
Hisashi Andoh, Hitachi, JP;
Masaichi Nagai, Hitachi, JP;
Isao Ikuta, Iwaki, JP;
Yoshimi Kato, Takahagi, JP;
Yoshihito Maeda, Mito, JP;
Tatsuya Sugita, Hitachi, JP;
Yutaka Sugita, Tokorozawa, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369100 ; 369283 ; 369288 ; 3692752 ; 3692751 ;
Abstract
An optical information handling device in which reflectivity of the conventional reproduction-only type optical disk is lowered to 60% or less and is made equal to the reflectivity of write-once type and rewritable type optical disks, whereby interchangeability in these of these disks is possible.