Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5691643 | Ground fault detecting apparatus and method for detecting ground fault of field circuit and exciting circuit by detecting ground fault current flowing from ground to neutral point of exciting circuit | Takashi Ishiguro | 1997-11-25 |
| 5675465 | Field ground fault detector and field ground fault relay for detecting ground fault corresponding to DC component extracted from ground fault current | Toshio Tanaka, Tetsuo Ugawa | 1997-10-07 |