Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4556580 | Method of repairing pipes laid underground | Hisao Ootsuga, Isao Saito, Motoyuki Koga | 1985-12-03 |
| 4427480 | Method and apparatus for providing the inner surface of a pipe line with a tubular lining material | Hisao Ohtsuga, Hiroshi Kimura, Takeshi Nakamura | 1984-01-24 |
| 4346922 | Device for preventing leakage at pipe joints | Hisao Ohtsuga, Koji Uzawa, Susumu Sudo, Tomoyoshi Hirose, Masafumi Miyao +1 more | 1982-08-31 |