Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4812420 | Method of producing a semiconductor device having a light transparent window | Kunito Sakai, Takashi Takahama | 1989-03-14 |
| 4798769 | Electrode supporting conduit tube for electrical heating of underground hydrocarbon resources | Osamu Hayashi, Ichiro Takahashi, Goro Okamoto, Kazuo Okahashi | 1989-01-17 |