| 发明名称 |
Gem identification viewer |
| 摘要 |
A gem identifying device using filtered transmitted light for use in distinguishing type-I colorless diamonds from type II colorless diamonds, and natural diamonds and gems from synthetic or treated diamonds and gems.
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| 申请公布号 |
US6292315(B1) |
申请公布日期 |
2001.09.18 |
| 申请号 |
US19990362762 |
申请日期 |
1999.07.28 |
| 申请人 |
GEMOLOGICAL INSTITUTE OF AMERICA, INC. |
发明人 |
RAVICH GILBERT N.;ELEN SHANE;SHIGLEY JAMES |
| 分类号 |
G01N21/87;G02B25/00;G02B27/02;(IPC1-7):G02B5/22 |
主分类号 |
G01N21/87 |
| 代理机构 |
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代理人 |
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