Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5689230 | Energy monitoring and control system using reverse transmission on AC line | Jeffrey D. Merwin, Philip D. Gunderson, Steven Purdy | 1997-11-18 |
| 5608292 | Single transistor ballast with filament preheating | John G. Konopka | 1997-03-04 |