Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4809520 | Refrigerant recovery and purification system | Roger D. Shirley | 1989-03-07 |
| 4805416 | Refrigerant recovery, purification and recharging system | Roger D. Shirley, Richard Parks, Dennis W. Hickman | 1989-02-21 |