发明名称 |
Neutral coloring photochromic 2H-naphtho[1,2-b] pyrans and heterocyclic pyrans |
摘要 |
Compositions comprising a naphtho [1,2-b]pyran of formula (I):wherein R7 and/or R9 is hydrogen or an amino group provided that R7 and R9 are not both hydrogen, and the other substituents are as defined in the specifcation.
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申请公布号 |
US6248264(B1) |
申请公布日期 |
2001.06.19 |
申请号 |
US19990381809 |
申请日期 |
1999.11.01 |
申请人 |
JAMES ROBINSON LIMITED |
发明人 |
CLARKE DAVID A.;HERON BERNARD MARK;GABBUTT CHRISTOPHER DAVID;HEPWORTH JOHN DAVID;PARTINGTON STEVEN MICHAEL;CORNS STEPHEN NIGEL |
分类号 |
G02C7/10;C07D311/92;C07D491/04;C07D491/052;C07D493/04;C07D495/04;C09K9/02;G02B5/23;(IPC1-7):G02B5/23 |
主分类号 |
G02C7/10 |
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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