Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9024596 | Tap changer | Udo Hertel, Armin Hirthammer, Anatoli Saveliev | 2015-05-05 |
| 8669746 | On-load tap changer comprising semiconductor switching elements | Dieter Dohnal, Hans-Henning Lessmann-Mieske | 2014-03-11 |
| 8648587 | Arrangement of a stepping switch on a control transformer | Dieter Dohnal | 2014-02-11 |
| 8624565 | On-load tap changer comprising semiconductor switching elements | Dieter Dohnal, Hans-Henning Lessmann-Mieske | 2014-01-07 |
| 8415987 | Tap switch with semiconductor switching elements | Dieter Dohnal, Hans-Henning Lessmann-Mieske | 2013-04-09 |
| 8289068 | Method for switching without any interruption between winding taps on a tap-changing transformer | Dieter Dohnal, Hans-Henning Lessmann-Mieske | 2012-10-16 |