Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4907165 | Electric energy measuring method | — | 1990-03-06 |
| 4752731 | Electronic type electric energy meter | — | 1988-06-21 |
| 4672236 | Voltage-to-frequency converter circuit | Seiichi Hamasaki | 1987-06-09 |