Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5160476 | Method for producing a resin pipe for use as the inner lining of existing pipes | Makoto Ijyuin, Akihiko Tsuda | 1992-11-03 |
| 5147697 | Polyvinyl chloride pipe for the inner lining of existing pipes | Makoto Ijyuin, Akihiko Tsuda | 1992-09-15 |