Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6281680 | Method and apparatus for distinguishing synthetic diamonds from natural diamonds | Marion Matthews | 2001-08-28 |
| 5559436 | Method and apparatus for distinguishing synthetic diamonds from natural diamonds | Marion Matthews | 1996-09-24 |