Antonelli, Terry, Stout & Kraus, LLP
Optical information recording medium
 A glass including SiO.sub.2, Na.sub.2 O, MgO, Al.sub.2 O.sub.3 and cobalt oxide, wherein the cobalt oxide is 4.5-85 wt % as an oxide of CoO or 4.9-91 wt % as an oxide of Co.sub.3 O.sub.4. 
Hitachi, Ltd.
G G G C G G C G G G Y G G G G Y C G Y G C Y G C G G
G11B G11B G11B C03C G11B G11B C03C G11B G11B G11B Y10S G11B G11B G11B G11B Y10T C03C G11B Y10T G11B C03C Y10S G11B C03C G11B G11B
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Takashi Toshimichi Motoyasu Takashi Yasutaka Ken Hiroki
Naito Shintani Terao Namekawa Suzuki Takahashi Yamamoto