Glass-ceramic composition for recording disk substrate

Patent 6593257 Issued on July 15, 2003. Estimated Expiration Date:

July 5, 2020. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

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Inventors

Assignee

Minolta Co., Ltd.

Application

No. 610337 filed on 07/05/2000

US Classes:

501/4, Silica containing crystalline phase (e.g., stuffed quartz, crystobalite, etc.)501/5Binary, ternary, quaternary, etc., metal silicate crystalline phase (e.g., mullite, diopside, sphene, plagioclase, slagcerams free of alumina, etc.)

Examiners

Primary: Group, Karl

Attorney, Agent or Firm

Burns, Doane, Swecker & Mathis, LLP

Foreign Patent References

9-208260 JP. 08/22/1997
9-314458 JP. 12/22/1997
10-208226 JP. 08/22/1998
10-226532 JP. 08/22/1998
11-16142 JP. 01/22/1999
11-16143 JP. 01/22/1999
11-322362 JP. 11/22/1999

International Classes

C03C 010/04
C03C 010/14

Foreign Application Priority Data

1999-07-06 JP

Abstract

A glass ceramics composition for recording disk substrate consists essentially, expressed in terms of weight percent on the oxide basis, of from 65 to 80 wt % of SiO2, from 3 to 15 wt % of Al2 O3, from 3 to 15 wt % of Li2 O, from 0.2 to 5 wt % of P2 O5, and from 0.1 to 15 wt % of ZrO2, wherein a value of ZrO2 /P2 O5 is within a range from 1.1 to 8.5, expressed in terms of weight percent on the oxide basis.