Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5098026 | Easy access pop off relief valve | Donald R. Dougan, Ronald D. Mizak | 1992-03-24 |
| 4721258 | Roll-and-race pulverizer with rotating throat | Donald R. Dougan, William C. Kish | 1988-01-26 |
| 4687145 | Roll-and-race pulverizer with rotating throat | Donald R. Dougan, William C. Kish | 1987-08-18 |