Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4516059 | Motor control chopper apparatus phase angle limiting | Richard D. Roberts, James H. Franz, Jr., Lalan G. Miller | 1985-05-07 |
| 4392091 | Vehicle propulsion control apparatus and method | Richard D. Roberts | 1983-07-05 |