Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5289043 | Switching system for selectively enabling electrical power to be applied to plural loads | Andrew Marshall, Derek Colman, David P. Dale | 1994-02-22 |
| 4977476 | Semiconductor switch | Andrew Marshall, Derek Colman, David P. Dale | 1990-12-11 |