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. 06, 2011
Filed:
Feb. 22, 2008
Applicant:
Akio Fukushima, Yokohama, JP;
Inventor:
Akio Fukushima, Yokohama, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 7/26 (2006.01); G11B 7/24 (2006.01);
U.S. Cl.
CPC ...
Abstract
It is an object of the invention to provide a multi layer optical disc that can be used effectively and an optical disc apparatus that can cope with the multi layer optical disc. The object described above can be accomplished by providing redundancy to the number of layers of the multi layer optical disc. The object can also be accomplished by providing reproducing/recording unit of the multi layer optical disc to the optical disc apparatus.