Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6252630 | Receiver and receiving method | Tatsuya Wakahara | 2001-06-26 |
| 5263899 | Cylindrical telescopic kelly-bar apparatus | Satoshi Nozaki, Shuichi Ajiro, Akio Kiue, Kenichi Miyata | 1993-11-23 |
| 4984936 | Stopper apparatus for rotary reaction force | Satoshi Nozaki, Muneo Yosida | 1991-01-15 |
| 4326736 | Swivel joint for reverse circulation drill | Masami Wada | 1982-04-27 |