Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7350595 | Drilling device and drilling method | Kusuo Sato, Toshio Imaoka | 2008-04-01 |
| 7131795 | Tool device, and method for drilling | Isamu Nagai | 2006-11-07 |
| 6959771 | Abrasive and boring method using the same | Tsuyoshi Kawahara | 2005-11-01 |
| 6394717 | High speed-perforating apparatus | Toshio Imaoka, Kusuo Sato | 2002-05-28 |
| 5218948 | Inside diameter blade | — | 1993-06-15 |