Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4798769 | Electrode supporting conduit tube for electrical heating of underground hydrocarbon resources | Osamu Hayashi, Sadamu Matsuda, Ichiro Takahashi, Goro Okamoto | 1989-01-17 |