Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4259097 | Filtering means for arc suppressing gas system | Donald M. Hansen | 1981-03-31 |
| 4208556 | Force convection heat pump and temperature measuring system for a gas insulated two pressure breaker | Donald M. Hansen | 1980-06-17 |