Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5353859 | Roller door apparatus | John Oltahfer, David Noon, David LEPPERT, Mark Ungs, Peter S. Schulte +1 more | 1994-10-11 |
| 5329781 | Frost control system | Nancy L. Farrey, William W. Hoerner, David LEPPERT | 1994-07-19 |
| 5203175 | Frost control system | Nancy L. Farrey, William W. Hoerner, David LEPPERT | 1993-04-20 |