Issued Patents 1997
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5638263 | Low and medium voltage PWM AC/DC power conversion method and apparatus | Kenneth E. Opal, Harry Abrams | 1997-06-10 |
| 5625545 | Medium voltage PWM drive and method | — | 1997-04-29 |
| 5619407 | Autotransformer | — | 1997-04-08 |