Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5317903 | Refrigerant charging system controlled by charging pressure change rate | Ralph A. McClelland, John P. Hancock | 1994-06-07 |
| 5231841 | Refrigerant charging system and control system therefor | Ralph A. McClelland, John P. Hancock | 1993-08-03 |
| 4771727 | Stamp and envelope moistener | George Spector | 1988-09-20 |
| 4755957 | Automotive air-conditioning servicing system and method | John P. Hancock | 1988-07-05 |