Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4929489 | Method of making and using selective conductive regions in diamond layers | Gisela A. M. Dreschhoff | 1990-05-29 |
| 4200506 | Process for providing identification markings for gemstones | Gisela A. M. Dreschhoff | 1980-04-29 |