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. 19, 2007
Filed:
Jan. 30, 2004
Hiroki Yamamoto, Hitachi, JP;
Takashi Naito, Hitachioota, JP;
Takashi Namekawa, Hitachi, JP;
Ken Takahashi, Tokai-mura, JP;
Masahiro Watanabe, Yokohama, JP;
Noriyuki Takeo, Yamakita-machi, JP;
Hiroki Yamamoto, Hitachi, JP;
Takashi Naito, Hitachioota, JP;
Takashi Namekawa, Hitachi, JP;
Ken Takahashi, Tokai-mura, JP;
Masahiro Watanabe, Yokohama, JP;
Noriyuki Takeo, Yamakita-machi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In accordance with the present invention, a glass substrate of a disk for recording information, containing oxides of rare earth elements and fine particles dispersed therein, and a disk for recording information and a disk apparatus for recording information using the glass substrate of the disk are provided. The glass substrate of the disk for recording information having preferable mechanical characteristics, as well as superior chemical stability, thermal stability, flatness, and transparency is provided, and a disk for recording information and a disk apparatus for recording information using the glass substrate of the disk are provided.