| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Japan | 11 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Mining | |
| #2 | Shafts | |
| #3 | Working stone |
| # | Name | Total Patents |
|---|---|---|
| #1 | Oishi Kazumi | 11 |
| #2 | Okawada Takeshi | 5 |
| #3 | Miki Masaaki | 5 |
| #4 | Iijima Michio | 5 |
| #5 | Ueda Kazunori | 5 |
| #6 | Tayama Minoru | 5 |
| #7 | Tsuchiya Kiyoshi | 5 |
| #8 | Orihara Kiyoto | 1 |
| #9 | Tsurumoto Jun | 1 |
| Publication | Filing date | Title |
|---|---|---|
| JP2006028904A | Twin header for work vehicle | |
| JP2004003365A | Excavating method and excavating machine | |
| JP2004019311A | Disk bit, cutter head and cutter drum | |
| JP2004019310A | Roller cutter and cutter head for rock bed excavator | |
| JP2004011170A | Free section excavator | |
| JP2002188394A | Cutter head, and rock bed drilling machine | |
| JP2000328879A | Tunnel boring machine | |
| JP2000328881A | Tunnel boring machine | |
| JP2000328880A | Tunnel boring machine | |
| JP2000328884A | Tunnel boring machine | |
| JP2000328878A | Tunnel boring machine |