Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4853607 | Non-isolated thermally responsive battery charger | Richard T. Walter, George W. Lipa | 1989-08-01 |
| 4835409 | Corded/cordless dual-mode power-operated device | Donald E. Elson, Richard T. Walter | 1989-05-30 |
| 4835410 | Dual-mode corded/cordless system for power-operated devices | Donald E. Elson, Richard T. Walter | 1989-05-30 |