Stock material or miscellaneous articles – Magnetic recording component or stock – Magnetic recording media substrate
Reexamination Certificate
2007-06-08
2011-12-13
Bernatz, Kevin M. (Department: 1785)
Stock material or miscellaneous articles
Magnetic recording component or stock
Magnetic recording media substrate
C428S848000, C428S848800, C360S135000, C065S030140, C501S068000
Reexamination Certificate
active
08076014
ABSTRACT:
According to one aspect of the present invention, provided is glass for use in substrate for information recording medium, which comprises, denoted as molar percentages, a total of 70 to 85 percent of SiO2and Al2O3, where SiO2content is equal to or greater than 50 percent and Al2O3content is equal to or greater than 3 percent; a total of equal to or greater than 10 percent of Li2O, Na2O and K2O; a total of 1 to 6 percent of CaO and MgO, where CaO content is greater than MgO content; a total of greater than 0 percent but equal to or lower than 4 percent of ZrO2, HfO2, Nb2O5, Ta2O5, La2O3, Y2O3and TiO2; with the molar ratio of the total content of Li2O, Na2O and K2O to the total content of SiO2, Al2O3, ZrO2, HfO2, Nb2O5, Ta2O5, La2O3, Y2O3and TiO2((Li2O+Na2O+K2O)/(SiO2+Al2O3+ZrO2+HfO2+Nb2O5+Ta2O5+La2O3+Y2O3+TiO2)) being equal to or less than0.28. Further provided are the substrate for information recording medium, information recording medium and their manufacturing methods according to the present invention.
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Hachitani Yoichi
Ikenishi Mikio
Osakabe Kinobu
Tachiwana Kazuo
Zou Xuelu
Bernatz Kevin M.
Falasco Louis
Hoya Corporation
Sughrue & Mion, PLLC
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