发明名称 |
ION EXCHANGEABLE SEGMENT GLASS |
摘要 |
<p>ION EXCHANGEABLE SEGMENT GLASS There is disclosed an ion exchange-strengthened ophthalmic segment glass suitable for the fabrication of fused bifocal and trifocal ophthalmic lenses. More particularly, there is disclosed a lanthanum-silicate based ophthalmic segment glass having indices of refraction of about 1.57 to about 1.65 which is suitable for chemical ion exchange strengthening so as to develop a compressively-stressed ion-exchanged surface layer having a depth of at least 60 micrometers.</p> |
申请公布号 |
CA1083821(A) |
申请公布日期 |
1980.08.19 |
申请号 |
CA19760262338 |
申请日期 |
1976.09.29 |
申请人 |
AMERICAN OPTICAL CORPORATION |
发明人 |
KROHN, DAVID A.;GRAF, ROBERT E.;DEEG, EMIL W. |
分类号 |
C03C3/076;C03C3/095;C03C21/00;G02C7/06;(IPC1-7):03C21/00 |
主分类号 |
C03C3/076 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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