Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 5914843 | Neon power supply with improved ground fault protection circuit | William Thomas Hopkins | 1999-06-22 | |
| 5128592 | High frequency ballast for gaseous discharge lamps | Russell G. Greenwood, Sylvan E. Irwin, IV | 1992-07-07 | $928,000 |
| 4873471 | High frequency ballast for gaseous discharge lamps | William H. Henrich, David Matthew Fischer, Lawrence J. Stratton, Herbert E. Pietsch | 1989-10-10 | $1,049,000 |
| 4791338 | Fluorescent lamp circuit with regulation responsive to voltage, current, and phase of load | William H. Henrich | 1988-12-13 | $1,487,000 |