Compositions: ceramic – Ceramic compositions – Devitrified glass-ceramics
Reexamination Certificate
2005-06-14
2005-06-14
Group, Karl (Department: 1755)
Compositions: ceramic
Ceramic compositions
Devitrified glass-ceramics
C501S010000, C428S690000
Reexamination Certificate
active
06905988
ABSTRACT:
Provided is a substrate for information recording medium composed of such a crystallized glass as having high Young's modulus, strength and heat resistance, being excellent in surface smoothness, surface homogeneity and surface processability, as well as having a relatively low temperature of glass liquid phase and being capable of producing cheaply, and an information recording medium using this substrate.The crystallized glass substrate for information recording medium comprising 35-65 mol % of SiO2, 5-25 mol % of Al2O3, 10-40 mol % of MgO and 5-15 mol % of TiO2, in which the total amount of aforementioned composition is at least equal to or higher than 92 mol % and the main crystals are enstatite and/or its solid solution. The information recording medium having this substrate and a recording layer formed on said substrate.
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Burns Doane Swecker & Mathis L.L.P.
Group Karl
Hoya Corporation
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