Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8011876 | Wind driven power generator | Donald R. Gradwohl | 2011-09-06 |
| 7063909 | Fuel-cell element stack with stress relief and methods | David Champion, Peter Mardilovich, Christopher Beatty | 2006-06-20 |
| 4227709 | Convertible hand truck-wagon | Donald R. Gradwohl | 1980-10-14 |