| 6239556 |
Long life discharge lamp operating circuit with reduced lamp flicker |
Gunther Hans Derra, Hanns E. Fischer, Thomas Krücken, Holger Moench, Rob Snijkers |
2001-05-29 |
| 6232725 |
Circuit arrangement for operating a high-pressure discharge lamp |
Gunther Hans Derra, Hanns E. Fischer, Thomas Krücken, Holger Moench, Rob Snijkers |
2001-05-15 |
| 6111765 |
Discharge lamp operating circuit using piezoelectric transformer and protective device |
Dieter Leers, Klaus Lohn, Martin Ossmann, Pieter Postma |
2000-08-29 |
| 6104141 |
Inventer-ballast using a piezoelectric transformer |
Dieter Leers, Klaus Lohn, Martin Ossmann, Pieter Postma |
2000-08-15 |
| 5689156 |
Circuit arrangement for detecting the amount of deposited electrode material on the wall of a lamp vessel |
Gunther Hans Derra, Hanns E. Fischer, Holger Monch |
1997-11-18 |
| 5608294 |
High pressure lamp operating circuit with suppression of lamp flicker |
Gunther Hans Derra, Hanns E. Fischer, Holger Monch |
1997-03-04 |
| 5262701 |
Circuit arrangement for operating a high pressure sodium lamp |
Gunther Hans Derra, Hans Peter Stormberg |
1993-11-16 |
| 5025197 |
Circuit arrangement for A.C. operation of high-pressure gas discharge lamps |
Ralf Schafer, Hans Peter Stormberg |
1991-06-18 |
| 4994716 |
Circuit arrangement for starting and operating gas discharge lamps |
Ralf Schafer, Hans Peter Stormberg |
1991-02-19 |
| 4937501 |
Circuit arrangement for starting a high-pressure gas discharge lamp |
Hans Peter Stormberg |
1990-06-26 |
| 4891563 |
Circuit arrangement for adjusting the operating voltage of high-pressure gas discharge lamps |
Ralf Schafer, Hans Peter Stormberg |
1990-01-02 |
| 4888524 |
Circuit for operating gas discharge lamps with a periodically alternating lamp current |
Ralf Schafer, Hans Peter Stormberg |
1989-12-19 |
| 4839560 |
Heatable electrode for high-pressure gas discharge lamps |
Ralf Schafer, Hans Peter Stormberg |
1989-06-13 |
| 4816721 |
Circuit arrangement for operating a high-pressure gas discharge lamp |
Ralf Schafer, Hans Peter Stormberg |
1989-03-28 |
| 4748381 |
Circuit arrangement for A.C. operation of gas discharge lamps |
Ralf Schafer, Hans Peter Stormberg |
1988-05-31 |
| 4714862 |
Circuit arrangement for igniting and operating gas discharge lamps |
Horst Dannert, Ralf Schafer, Hans Peter Stormberg |
1987-12-22 |
| 4705991 |
Method of operating a high-pressure metal vapor discharge lamp and circuit arrangement for carrying out this method |
Reinhard Kersten, Rolf Schafer, Hans Peter Stormberg |
1987-11-10 |
| 4594531 |
Circuit arrangement for operating high-pressure gas discharge lamps |
Ralf Schafer, Hans Peter Stormberg |
1986-06-10 |
| 4539513 |
Circuit arrangement for starting and operating a high-pressure gas discharge lamp |
Ralf Schafer, Hans Peter Stormberg |
1985-09-03 |
| 4471269 |
Circuit arrangement for operating a high-pressure gas discharge lamp |
Ralf Sch/a/ fer, Hans Peter Stormberg |
1984-09-11 |
