Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6507157 | Electronic ballast system with dual power and dimming capability | Robert Erhardt, Steven H. Pilgrim, II, Ching-Yao Hung | 2003-01-14 |
| 6489729 | Auxiliary lighting system for high intensity discharge lamp | Robert Erhardt, Ching-Yao Hung, Seymour Perkins, III, Oscar Deurloo | 2002-12-03 |
| 5223767 | Low harmonic compact fluorescent lamp ballast | — | 1993-06-29 |
| 4415842 | Television receiver start-up circuit | William Trzyna | 1983-11-15 |