Compositions: ceramic – Ceramic compositions – Glass compositions – compositions containing glass other than...
Reexamination Certificate
2007-03-20
2007-03-20
Group, Karl (Department: 1755)
Compositions: ceramic
Ceramic compositions
Glass compositions, compositions containing glass other than...
C501S067000, C428S846900
Reexamination Certificate
active
10633893
ABSTRACT:
A glass substrate for use as the substrate of an information recording medium such as a magnetic disk, magneto-optical disk, DVD, or MD or of an optical communication device, and a glass composition for making such a glass substrate, contains the following glass ingredients: 45 to 75% by weight of SiO2; 1 to 20% by weight of Al2O3; 0 to 8% by weight, zero inclusive, of B2O3; SiO2+Al2O3+B2O3accounting for 60 to 90% by weight; a total of 0 to 20% by weight, zero inclusive, of R2O compounds, where R=Li, Na, and K; and a total of 0 to 15% by weight, zero inclusive, of TiO2+ZrO2+LnxOy, where LnxOyrepresents at least one compound selected from the group consisting of lanthanoid metal oxides, Y2O3, Nb2O5, and Ta2O5.
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Japanese “Information Submission Statement”, dated May 20, 2005, for counterpart Japanese Patent Application No. 2003-153178, along with an English-translation thereof.
Japanese Offering of Information, dated Aug. 2, 2006, for counterpart Japanese Patent Application No. 2003-153178; Together with a copy of an English-language translation thereof.
Kawai Hideki
Mori Toshiharu
Group Karl
Minolta Co. , Ltd.
Sidley Austin LLP
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