Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6071181 | Knife sharpening machine | John Wightman, Walter J. Woehler, Jim Campbell, William M. Haack | 2000-06-06 |
| 4230657 | Method and apparatus for producing artificial greenery | William M. Haack | 1980-10-28 |