Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4878356 | Storage tank scale for a refrigerant recovery system | Robert J. Punches, Roger D. Shirley | 1989-11-07 |
| 4879546 | Ultrasonic hand-held refrigerant leak detector | Byron J. Dunham, Don A. Bulla | 1989-11-07 |
| 4798055 | Refrigeration system analyzer | Ralph C. Lower, Byron J. Dunham, Don A. Bulla | 1989-01-17 |