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. 10, 2012
Filed:
Jul. 09, 2007
Hideki Kawai, Kobe, JP;
Hideki Kawai, Kobe, JP;
Konica Minolta Opto, Inc., Tokyo, JP;
Abstract
A method for manufacturing a glass substrate which has a uniform and minute pattern of stripes formed on the surface thereof by ultraprecision polishing, and which allows the recording capacity of a magnetic disk to be increased, includes an inspecting step before the glass substrate is subjected to ultraprecision polishing, whether the Young's modulus Es in topmost part as determined by the nanoindentation method and the Young's modulus Eg as determined by ultrasonic resonance fulfill the inequality 0.8 Eg<Es<1.2 Eg; or the hardness Hs in topmost part as determined by the nanoindentation method and the Vickers hardness Hv fulfill the inequality 0.8 Hv<Hs<1.2 Hv.