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:
Jun. 08, 2004
Filed:
Jun. 21, 2001
Applicant:
Inventor:
Takanobu Higuchi, Tsurugashima, JP;
Assignee:
Pioneer Corporation, Tokyo-To, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B 7/24 ;
U.S. Cl.
CPC ...
G11B 7/24 ;
Abstract
To present an optical recording medium having four or more information recording planes which can be read from one side. A first reflective layer has a layer mainly composed of titanium oxide, a second reflective layer has a layer mainly composed of titanium oxide, a third reflective layer has a layer of an alloy mainly composed of silver, and a fourth reflective layer has a layer of an alloy mainly composed of aluminum.