Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5406540 | Optical disk recording performance | Robert Longman, Peter R. Helfet, Quentin J. Lister | 1995-04-11 |
| 5173856 | Vehicle data recording system | Anthony Purnell, John C. Mumford, Keith A. Bradbury, Raymond A. Wardell | 1992-12-22 |