Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4589332 | Flashing system for a grain drying bin | Donald B. Brockhaus, Walter E. Swartz, Vernon H. Sietmann | 1986-05-20 |
| 4587893 | Grain drying bin | Donald B. Brockhaus, Walter E. Swartz, Vernon H. Sietmann | 1986-05-13 |