Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8669746 | On-load tap changer comprising semiconductor switching elements | Oliver Brueckl, Dieter Dohnal | 2014-03-11 |
| 8624565 | On-load tap changer comprising semiconductor switching elements | Oliver Brueckl, Dieter Dohnal | 2014-01-07 |
| 8415987 | Tap switch with semiconductor switching elements | Oliver Brueckl, Dieter Dohnal | 2013-04-09 |
| 8289068 | Method for switching without any interruption between winding taps on a tap-changing transformer | Oliver Brueckl, Dieter Dohnal | 2012-10-16 |
| 6856122 | Thyristor tap changer | Dieter Dohnal | 2005-02-15 |
| 6284082 | Method of producing a wound insulating pipe | Klaus Schuler, Dieter Lorenz, Walter Gross, Stefan Hain, Hans Schmuck +1 more | 2001-09-04 |
| 6203647 | Method of producing a wound insulating pipe | Klaus Schuler, Dieter Lorenz, Walter Gross, Stefan Hain, Hans Schmuck +1 more | 2001-03-20 |
| 5786552 | Switching arrangement for load change-over switches of step switches and for selector switches | Dieter Dohnal, Josef Neumeyer, Leonhard Pillmeier | 1998-07-28 |
| 5773970 | Tap changer with tickler coil for arcless tap changing | Dieter Dohnal | 1998-06-30 |
| 5694034 | Tap changer for a tapped or stepped transformer | Dieter Dohnal | 1997-12-02 |
| 5523674 | Step switch | Dieter Dohnal, Josef Neumeyer, Wolfgang Albrecht, Gunter Kloth, Rolf Lauterwald | 1996-06-04 |
| 4550285 | Load-switching circuit for antiparallel thyristor networks and a tapped transformer | Kurt Kugler, Franz Wein | 1985-10-29 |