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:
Aug. 07, 1990
Filed:
Apr. 12, 1988
Applicant:
Inventors:
Kenji Suzuki, Yamanashi, JP;
Toshihiko Takishita, Yamanashi, JP;
Satoru Fukuoka, Yamanashi, JP;
Hirokazu Hashikawa, Yamanashi, JP;
Tsuyoshi Hayashi, Yamanashi, JP;
Minemasa Ohta, Yamanashi, JP;
Assignees:
Pioneer Electronic Corporation, Tokyo, JP;
Pioneer Video Corporation, Yamanashi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369279 ; 3692751 ; 369100 ; 369109 ; 369111 ;
Abstract
An optical disk of the type including guide grooves is improved by regulating the width of the grooves, and thus the width of the adjacent land portion, in accordance with the type of information recorded at that part of the land.