Burns, Doane, Swecker & Mathis, LLP
Glass-ceramic composition for recording disk substrate
A glass ceramics composition for recording disk substrate contains, essentially, expressed in terms of weight percent on the oxide basis, from 54.5 to 59.5 wt % of SiO2, from 10 to 30 wt % of Al2O3, from 10 to 30 wt % of MgO, and from 3 to 12 wt % of Li2O.
Minolta Co., Ltd.
C C G
C03C C03C G11B
inventional inventional inventional
Toshiharu Kazuhiko Hiroshi Akira Hideki Hideki
Mori Ishimaru Yuki Sugimoto Kawai Nagata