Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4625851 | Coin testing apparatus | Peter R. Johnson, Derek Hutchinson, Robert Dean | 1986-12-02 |
| 4601380 | Apparatus for checking the validity of coins | Robert Dean, Derek Hutchinson | 1986-07-22 |
| 4546869 | Coin testing apparatus | Robert Dean, Frederic Heiman | 1985-10-15 |