Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6635309 | Process for the color enhancement of gemstones | — | 2003-10-21 |
| 6376031 | Method for enhancing the color of minerals useful as gemstones | — | 2002-04-23 |
| 5888918 | Method for enhancing the color of minerals useful as gemstones | — | 1999-03-30 |
| 5084909 | Method of processing gemstones to enhance their color | — | 1992-01-28 |