Crystallized glass for information recording medium,...

Details Crystallized glass for information recording medium,... Crystallized glass for information recording medium,...

2007-09-04

2007-09-04

Chaney, Carol (Department: 1773)

Stock material or miscellaneous articles

Magnetic recording component or stock

Magnetic recording media substrate

C428S432000, C501S004000

Reexamination Certificate

active

11219913

ABSTRACT:
Enclosed are crystallized glasses suitable for a substrate for an information recording medium such as a magnetic disc, optical disc, or optomagnetic disc, a substrate for information recording medium using such a crystallized glass substrate, and an information recording medium using such a substrate for information recording medium. The crystallized glasses are capable of providing a glass substrate having a high Young's modulus, as well as excellent mechanical strength, surface flatness, and heat resistance and having an excellent surface smoothness upon polishing. Glass substrate having an excellent surface smoothness using such a crystallized glass are also disclosed.

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U.S. Appl. No. 60/031,662, filed Nov. 21, 1996.

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