Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 4392121 | Receiver for A.C. electrical supply signalling arrangement | Charles G. Leedham | 1983-07-05 | $4,242,000 |
| 4254403 | Systems for transmitting information in an alternating current electricity supply system | Leonardo Perez-Cavero, Michael W. Cross, Geoffrey Fielding | 1981-03-03 | $2,818,000 |