Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5872429 | Coded communication system and method for controlling an electric lamp | Yongping Xia, Sreeraman Venkitasubrahmanian, Thomas Farkas | 1999-02-16 |
| 5751115 | Lamp controller with lamp status detection and safety circuitry | Yongping Xia, Sreeraman Venkitasubrahmanian, Paul Leyton | 1998-05-12 |
| 5691605 | Electronic ballast with interface circuitry for multiple dimming inputs | Yongping Xia, Joshua Zhu, Sreeraman Venkitasubrahmanian, Thomas Farkas | 1997-11-25 |
| 5650694 | Lamp controller with lamp status detection and safety circuitry | Yongping Xia, Sreeraman Venkitasubrahmanian, Paul Leyten | 1997-07-22 |
| 5604411 | Electronic ballast having a triac dimming filter with preconditioner offset control | Sreeraman Venkitasubrahmanian, Gert W. Bruning, Paul R. Veldman, Thomas Farkas, Yongping Xia | 1997-02-18 |
| 5559395 | Electronic ballast with interface circuitry for phase angle dimming control | Sreeraman Venkitasubrahmanian, Thomas Farkas, Yongping Xia | 1996-09-24 |
| 4609929 | Conductivity-enhanced combined lateral MOS/bipolar transistor | Barry M. Singer | 1986-09-02 |