Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4860102 | Circuitry for automatically switching the control speed of a phase-control circuit | Uwe Hartmann, Udo Mai | 1989-08-22 |
| 4835610 | Arrangement for automatic switching of the regulating speed of a phase regulating circuit | Uwe Hartmann, Udo Mai | 1989-05-30 |
| 4814672 | Circuitry for limiting an operating voltage obtained by way of a rectifier from a secondary winding of a transformer | Uwe Hartmann, Udo Mai | 1989-03-21 |