Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5379605 | Method for cleaning air conditioning system | Fred L. Ptacek, Charles R. Smith | 1995-01-10 |
| 5353603 | Dual refrigerant recovery apparatus with single vacuum pump and control means | Fred L. Ptacek, Charles R. Smith, Steven R. Kouzes | 1994-10-11 |
| 5337578 | Trapped air monitor for a refrigerant recovery unit | Fred L. Ptacek, Charles R. Smith | 1994-08-16 |