Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5455563 | Magnetic marker and method for modifying the magnetic properties thereof | Dafydd G. Davies | 1995-10-03 |
| 4960651 | Magnetic devices | Robert M. Pettigrew, Dafydd G. Davies | 1990-10-02 |
| 4940966 | Article detection and/or recognition using magnetic devices | Robert M. Pettigrew, Dafydd G. Davies, Michael D. Crossfield | 1990-07-10 |