| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Canada | 3 | |
| #2 | Brazil | 2 | |
| #3 | EPO (European Patent Office) | 2 | |
| #4 | Japan | 2 | |
| #5 | United States | 2 | |
| #6 | Republic of Korea | 1 | |
| #7 | Taiwan | 1 |
| # | Industry | |
|---|---|---|
| #1 | Machines | |
| #2 | Machine tools | |
| #3 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Turning | |
| #2 | Unspecified technologies | |
| #3 | Unspecified technologies | |
| #4 | Gearing | |
| #5 | Wood saws | |
| #6 | Clutches and brakes | |
| #7 | Grinding or polishing devices |
| # | Name | Total Patents |
|---|---|---|
| #1 | Nakamura Daijiro | 10 |
| #2 | Goto Yoshiaki | 1 |
| #3 | Nakamura Daijro | 1 |
| Publication | Filing date | Title |
|---|---|---|
| JP2001259908A | Tool chuck | |
| JPH10231848A | Tightening mechanism for rotary work member | |
| CA2125502A1 | Tightening screw | |
| US5322303A | Tool chuck | |
| US5261679A | Keyless type tool chuck |