Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7293718 | Variable output heating and cooling control | Paul E. Sigafus, Ralph H. Torborg, James W. Ratz | 2007-11-13 |
| 6866202 | Variable output heating and cooling control | Paul E. Sigafus, Ralph H. Torborg, James W. Ratz | 2005-03-15 |
| 6864659 | Variable speed controller for air moving applications using an AC induction motor | James W. Ratz, Paul E. Sigafus, Nickolas G. Vrionis | 2005-03-08 |