Issued Patents All Time
Showing 1–14 of 14 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5627712 | Transformer differential relay | — | 1997-05-06 |
| 4873602 | Ripple attenuator for AC power transmission line protective relays | — | 1989-10-10 |
| 4825323 | Out-of-step blocking unit | — | 1989-04-25 |
| 4825327 | Negative and zero sequence directional overcurrent unit for AC power transmission line protection | George E. Alexander | 1989-04-25 |
| 4821137 | Positive sequence distance relay for AC power transmission line protection | — | 1989-04-11 |
| 4819119 | Faulted phase selector for single pole tripping and reclosing schemes | — | 1989-04-04 |
| 4751604 | Comparison signal error detector for protective relay system | — | 1988-06-14 |
| 4686601 | Ground distance relay for AC power transmission line protection | George E. Alexander | 1987-08-11 |
| 4453191 | Overvoltage directional relay | — | 1984-06-05 |
| 4447845 | Reactance relay | — | 1984-05-08 |
| 4433353 | Positive sequence undervoltage distance relay | — | 1984-02-21 |
| 4420788 | Phase relay for AC power transmission line protection | George E. Alexander | 1983-12-13 |
| 4342064 | Static distance relays with improved polarizing signal | — | 1982-07-27 |
| 4296451 | Ultra high speed protective relay circuit | — | 1981-10-20 |