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. 02, 2011
Filed:
May. 25, 2007
Atsushi Koyama, Tokyo, JP;
Teppei Osawa, Tokyo, JP;
Tomoki Ushida, Tokyo, JP;
Kentaro Iida, Tokyo, JP;
Mamoru Usami, Tokyo, JP;
Hideki Hijikata, Tokyo, JP;
Atsushi Koyama, Tokyo, JP;
Teppei Osawa, Tokyo, JP;
Tomoki Ushida, Tokyo, JP;
Kentaro Iida, Tokyo, JP;
Mamoru Usami, Tokyo, JP;
Hideki Hijikata, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
An information medium substrate is formed as a flat plate and includes a first convex part formed on one surface of the information medium substrate in a region between a rim part of a center hole and an inner circumferential edge of an information region and a second convex part formed on another surface of the information medium substrate at a position that overlaps a protruding end part of the first convex part in a thickness direction of the information medium substrate.