Assessing the color of gemstones and the like
US4461568A · kind A · utility
16Cited by
5References
15Claims
0Family size
Inventors
Key dates
| Filing date | Jun 10, 1981 |
| Grant date | Jul 24, 1984 |
| Priority date | — |
| Expiry date | Jun 10, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J3/501
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The color of gemstones or the like is assessed by projecting light onto the stone, using an interrupting member to regularly interrupt the path of the light shortly before it reaches the stone, the member having a normally white, diffusing interrupting surface, and using a detector for detecting the color of the light coming from the gemstone and from the interrupting surface of the interrupting member. Preferably, the stone is mounted in a chamber having normally white, diffusing internal walls and the diffusing interrupting surface is within the chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.