Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D313947 | Combined engine analyzer and cart | Lee Radtke | 1991-01-22 |
| D313764 | Diagnostic analyzer | Lee Radtke | 1991-01-15 |
| D310789 | Engine analyzer | Lee Radtke | 1990-09-25 |
| 4470569 | Locking, redundant slat drive mechanism | Louis T. Kramer | 1984-09-11 |
| D257331 | Engine exhaust emission analyzer | David E. Maxwell, Lee Radtke | 1980-10-14 |
| D257013 | Engine exhaust emission analyzer | David E. Maxwell, Lee Radtke | 1980-09-23 |