Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4916927 | Lock and method of securing and releasing a member | John O'Connell, Roy S. Jefferies | 1990-04-17 |
| 4854146 | Security device and method | John O'Connell, Roy S. Jefferies | 1989-08-08 |
| 4791280 | Method of operating a security device, security device and data carriers for use in the method | John O'Connell, Alan Webster, Roy S. Jefferies | 1988-12-13 |