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:
Apr. 02, 2013
Filed:
Apr. 21, 2010
Masatsugu Suwabe, Miyagi, JP;
Hiroshi Nakayama, Miyagi, JP;
Takahiro Igari, Miyagi, JP;
Teruyuki Ota, Miyagi, JP;
Masatsugu Suwabe, Miyagi, JP;
Hiroshi Nakayama, Miyagi, JP;
Takahiro Igari, Miyagi, JP;
Teruyuki Ota, Miyagi, JP;
Sony Corporation, Tokyo, JP;
Abstract
An optical recording medium includes: a substrate having a first principal surface and a second principal surface; one or plural information signal layers formed on the first principal surface of the substrate for undergoing recording or reproduction of information signals upon irradiation with light; and a barrier layer formed on the second principal surface of the substrate for suppressing the gas release from the second principal surface of the substrate, wherein an area of a region exposing from the barrier layer of the second principal surface of the substrate is not more than 688 mm.