Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4954974 | Turbine engine fan speed monitor | Kenneth P. Widner, Gary D. Guenther | 1990-09-04 |
| 4821216 | Multifunction meter for use in an aircraft | Robert L. Hartung | 1989-04-11 |
| 4699807 | Finish restorer | — | 1987-10-13 |
| 4635751 | Silencer | — | 1987-01-13 |