Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5627718 | Apparatus providing protection and metering in an ac electrical system utilizing a multi-function sampling technique | Joseph C. Engel, Richard A. Johnson | 1997-05-06 |
| 5600527 | Circuit interrupter providing protection and waveform capture for harmonic analysis | Joseph C. Engel, Richard A. Johnson | 1997-02-04 |