Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4870221 | Oil-filled capacitor | Atsushi Sato, Shigenobu Kawakami, Keiji Endo | 1989-09-26 |
| 4802058 | Novel method for refining electrical insulating oil | Shigenobu Kawakami, Keiji Endo, Atsushi Sato | 1989-01-31 |