Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12194504 | Melee gemstone sorting | Philip Harris, Peter Stanley Rose, Andrew John Portsmouth, Trevor Anthony Harries, David Fisher | 2025-01-14 |
| 11541429 | Gemstone sorting | Andrew John Portsmouth, Nicholas Matthew Davies, David Fisher | 2023-01-03 |
| 10345245 | Luminescence measurements in diamond | James Gordon Charters Smith, David Fisher | 2019-07-09 |
| 10082469 | Luminescence measurements in diamond | James Gordon Charters Smith, David Fisher | 2018-09-25 |