| US 7,582,580 B2 | ||
| Optical glass | ||
| Hiroyuki Ohkawa, Tokyo (Japan); Jun Sasai, Tokyo (Japan); and Naoki Sugimoto, Tokyo (Japan) | ||
| Assigned to Asahi Glass Company, Limited, Tokyo (Japan) | ||
| Filed on Aug. 21, 2008, as Appl. No. 12/195,496. | ||
| Application 12/195496 is a continuation of application No. PCT/JP2007/053108, filed on Feb. 20, 2007. | ||
| Claims priority of application No. 2006-044054 (JP), filed on Feb. 21, 2006. | ||
| Prior Publication US 2008/0312063 A1, Dec. 18, 2008 | ||
| Int. Cl. C03C 3/15 (2006.01); C03C 3/155 (2006.01); C03C 3/095 (2006.01) | ||
| U.S. Cl. 501—50 [501/51; 501/64; 501/78] | 3 Claims |
| 1. An optical glass comprising, by mass %:
46 to 70 of B2O3;
3 to 10 of Li2O;
5 to 15 of Y2O3;
0 to 46 of SiO2:
0 to 20 of Al2O3:
0 to 40 of MgO+CaO+SrO+BaO;
0 to 30 of La2O3; and
0 to 10 of ZrO2+TiO2+Gd2O3.
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