Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4919533 | Method for detecting diamonds in remote locations | Donald L. Gerrard, John E. Preedy | 1990-04-24 |
| 4907875 | Diamond separation process | Donald L. Gerrard | 1990-03-13 |
| 4900147 | Diamond mapping | Donald L. Gerrard | 1990-02-13 |
| 4875771 | Method for assessing diamond quality | Donald L. Gerrard | 1989-10-24 |