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. 15, 2015
Filed:
Sep. 03, 2010
Applicant:
Hazuki Nakae, Kyoto, JP;
Inventor:
Hazuki Nakae, Kyoto, JP;
Assignee:
HOYA CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 5/73 (2006.01); G11B 5/735 (2006.01);
U.S. Cl.
CPC ...
G11B 5/7315 (2013.01); G11B 5/735 (2013.01); G11B 2220/2516 (2013.01); Y10T 428/24355 (2015.01);
Abstract
For the purpose of providing a glass substrate for an information recording medium capable of acquiring a low GA value, provided is the glass substrate for an information recording medium, wherein a surface of the glass substrate has an arithmetic mean undulation Wa of less than 0.6 nm, and a fine undulation having a root-mean-square height Rq of less than 0.01 nm at a measurement wavelength of 80-120μm in a radial direction.