Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4700688 | Ventilating hood | Roger O. Zoellner, Ronald C. Hoffmann | 1987-10-20 |
| 4286572 | Ventilating hood | Roger O. Zoellner, Ronald C. Hoffmann | 1981-09-01 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4700688 | Ventilating hood | Roger O. Zoellner, Ronald C. Hoffmann | 1987-10-20 |
| 4286572 | Ventilating hood | Roger O. Zoellner, Ronald C. Hoffmann | 1981-09-01 |