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 47.5 to 58 wt % of SiO2, from 10 to 30 wt % of Al2O3, from 10 to 30 wt % of MgO, and from 0.1 to 2.8 wt % of ZrO2.
Minolta Co., Ltd.
C C
C03C C03C
inventional inventional
Hiroshi Akira Hideki Hideki Kazuhiko Toshiharu
Yuki Sugimoto Nagata Kawai Ishimaru Mori