Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6050258 | Exhaust fan with dry lubricant coating | Emery W. Neitzel, Arnold S. Heil, David Dahl | 2000-04-18 |
| 5809993 | Exhaust fan with dry lubricant coating | Emery W. Neitzel, Arnold S. Heil, David Dahl | 1998-09-22 |