Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4868970 | Method of making an electric motor | Roy David Schultz, A. Clark Altizer | 1989-09-26 |
| 4797592 | Dynamo electric machine with upwardly shifted ripple frequency | — | 1989-01-10 |