Issued Patents All Time
Showing 26–50 of 53 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7786679 | Electronic ballast for discharge lamps having an EOL monitoring circuit | — | 2010-08-31 |
| 7786683 | Circuit arrangement and method for operating at least one electric lamp and at least one LED | Olaf Busse, Markus Heckmann, Reinhard Lecheler, Alfons Lechner, Siegfried Mayer +7 more | 2010-08-31 |
| 7544948 | Control of the UV radiation sources for a weathering apparatus on the basis of the averaged radiation intensity | Artur Schönlein, Bernhard Borner, Peter March | 2009-06-09 |
| 7355348 | Ballast for a discharge lamp having a continuous-operation control circuit | — | 2008-04-08 |
| 7348581 | UV light-emitting diodes as a radiation source in a device for the artificial weathering of samples | Peter March | 2008-03-25 |
| 7327094 | Circuit arrangement and method for operating at least one electric lamp | Olaf Busse, Markus Heckmann, Reinhard Lecheler, Alfons Lechner, Siegfried Mayer +7 more | 2008-02-05 |
| 7309963 | Smoothing circuit for improving EMC | Olaf Busse, Markus Heckmann, Reinhard Lecheler, Alfons Lechner, Siegfried Mayer +7 more | 2007-12-18 |
| 7242154 | Circuit arrangement and method for operation of lamps | — | 2007-07-10 |
| 7193375 | Electronic ballast having a pump circuit for a discharge lamp having preheatable electrodes | — | 2007-03-20 |
| 7190127 | Shutdown circuit | — | 2007-03-13 |
| 7057355 | Drive circuit for operating at least one lamp in an associated load circuit | — | 2006-06-06 |
| 6936976 | Circuit arrangement and method for starting and operating gas discharge lamps with heatable electrode filaments | — | 2005-08-30 |
| 6933681 | Circuit arrangement and method for starting and operating discharge lamps | — | 2005-08-23 |
| 6806657 | Device for operating discharge lamps | Harald Schmitt | 2004-10-19 |
| 6677716 | Operating device for gas discharge lamp | Arwed Storm | 2004-01-13 |
| 6525489 | Circuit arrangement for operating electric lamps | — | 2003-02-25 |
| 6466313 | Method and apparatus for determining the time curve of the intensity of radiation in a weathering testing device | Christian Bernatek | 2002-10-15 |
| 6259213 | Circuit arrangement for operating at least one low-pressure discharge lamp | — | 2001-07-10 |
| 6198231 | Circuit configuration for operating at least one discharge lamp | Bernhard Schemmel, Michael Weirich | 2001-03-06 |
| 5898816 | Method for treating material samples and apparatus for testing exposure to light and weathering | Roland Heeger, Arthur Schonlein, Peter March | 1999-04-27 |
| 5831396 | Circuit arrangement for operating electric lamp | — | 1998-11-03 |
| 5825136 | Circuit arrangement for operating electric lamps, and an operating method for electronic lamps | — | 1998-10-20 |
| 5783911 | Circuit arrangement for operating electric lamps, and operating method for electric lamps | — | 1998-07-21 |
| 5589740 | Semiconductor-controlled operating circuit for one or more low-pressure discharge lamps, typically fluorescent lamps | Alwin Veser | 1996-12-31 |
| 5583399 | Ballast for one or more fluorescent lamps including threshold sensitive filament voltage preheating circuitry | — | 1996-12-10 |