Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5234242 | Submarine cable grapnel | Takashi Mizuguchi, Yoshihiro Ejiri, Kikuo Shirai | 1993-08-10 |
| 4678371 | Burying device for submarine cables and method for guiding the same | Hideo Ishihara, Yoshinao Iwamoto, Shizuo Suzuki, Yuichi Sirasaki, Kenichi Asakawa | 1987-07-07 |
| 4625172 | Apparatus for supplying AC current to an underwater cable | Hideo Ishihara, Yoshinao Iwamoto, Shizuo Suzuki, Yuichi Sirasaki, Kenichi Asakawa | 1986-11-25 |
| 4540942 | Alternating current induction method using an annular magnetic coupling body for detecting the position of a buried submarine cable | Hideo Ishihara, Yoshinao Iwamoto, Shizuo Suzuki, Yuichi Sirasaki, Kenichi Asakawa | 1985-09-10 |
| 4537530 | Marine cable burying method and device therefor | Hideo Ishihara, Yoshinao Iwamoto, Hifumi Sakaguchi, Masao Morita, Toshio Izawa | 1985-08-27 |
| 4384808 | Under-water cable burying device | Yoshinao Iwamoto, Hifumi Sakaguchi, Kenichi Asakawa | 1983-05-24 |
| 4317079 | Buried cable locating system | Takasuke Fukui, Yoshinao Iwamoto, Yuichi Shirasaki, Masayuki Fujise | 1982-02-23 |