Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4319411 | Aspirating panel for grain bins | — | 1982-03-16 |
| 4292899 | Protective element for fork-lift pallets | — | 1981-10-06 |
| 4256029 | Pressure reducing exhaust method and structure for ventilated grain bins | Sylvester L. Steffen | 1981-03-17 |