Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6507157 | Electronic ballast system with dual power and dimming capability | Robert Erhardt, Steven H. Pilgrim, II, Raymond Kulka | 2003-01-14 |
| 6489729 | Auxiliary lighting system for high intensity discharge lamp | Robert Erhardt, Raymond Kulka, Seymour Perkins, III, Oscar Deurloo | 2002-12-03 |