Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4882470 | Boring device for opening passages to branch portions of a lined main pipe line | Hisao Otsuga, Akio Morinaga, Osamu Toyoshima, Shinji Shimokawa | 1989-11-21 |
| 4350548 | Method and apparatus for providing the inner surface of a pipe line with a lining | Akio Morinaga, Masao Hirayama, Akira Morita | 1982-09-21 |
| 4334943 | Method for smoothly evaginating a tubular material under pressure | Akio Morinaga, Masao Hirayama, Akira Morita | 1982-06-15 |