Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6139410 | Main body of grinding assembly for use in track rail joint grinding apparatus | Yosiaki Okumura | 2000-10-31 |
| 5577954 | Grinding apparatus of welded residue on seam of rail head | Yosiaki Okumura | 1996-11-26 |
| 4694891 | Boiler apparatus utilizing exhaust gas heat | Yasushi Okumura | 1987-09-22 |