Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4474726 | Method of producing a channeled plastic pipe with closed channel ends | Takehiro Itoh, Hishayoshi Toyoshima, Jun Yoshikawa | 1984-10-02 |
| 4412802 | Molding device for forming a socket end on a plastic pipe | Tadao Yoshizawa, Masayuki Sakaguchi, Yoshiaki Hara, Junsuke Kyomen, Ryuichi Yoneda +1 more | 1983-11-01 |
| 4279853 | Method of forming a socket end on a plastic pipe and a molding device for use of the method | Tadao Yoshizawa, Masayuki Sakaguchi, Yoshiaki Hara, Junsuke Kyomen, Ryuichi Yoneda +1 more | 1981-07-21 |