Method for decolorizing diamonds
US8110171B1 · kind B1 · utility
4Cited by
5References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 15, 2006 |
| Grant date | Feb 7, 2012 |
| Priority date | — |
| Expiry date | Jul 21, 2028 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC30B29/04
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method for changing the color of a diamond. The method comprises placing the diamond in a substrate holder in a chemical vapor deposition (CVD) equipment. The CVD equipment is maintained at pressures near or below atmospheric pressure. A mixture of gases including hydrogen is introduced inside the CVD equipment. The introduced mixture of gases is energized by using microwave radiation to heat the diamond to temperatures above 1400° C. Then, the diamond is maintained at temperatures above 1400° C. for few seconds to few hours.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.