Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5527493 | Air treating device | Mark W. McElfresh, Jim F. Warner, Charles A. Curtiss, Martin Bogenstaerter | 1996-06-18 |
| 5478505 | Air treating device | Mark W. McElfresh, Jim F. Warner, Charles A. Curtiss, Martin Bogenstaerter | 1995-12-26 |