| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Australia | 3 | |
| #2 | EPO (European Patent Office) | 3 | |
| #3 | United States | 3 | |
| #4 | China | 2 | |
| #5 | WIPO (World Intellectual Property Organization) | 2 | |
| #6 | Canada | 1 | |
| #7 | Hong Kong | 1 | |
| #8 | Republic of Korea | 1 |
| # | Industry | |
|---|---|---|
| #1 | Thermal processes | |
| #2 | Machine tools | |
| #3 | Machines | |
| #4 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Air-conditioning | |
| #2 | Punching metal | |
| #3 | Unspecified technologies | |
| #4 | Pipes |
| # | Name | Total Patents |
|---|---|---|
| #1 | Iizuka Shozo | 13 |
| #2 | Yamamoto Toshio | 4 |
| #3 | Hara Takashi | 4 |
| #4 | Yoshimoto Yoshimasa | 4 |
| #5 | Marukawa Mitsuru | 4 |
| #6 | Shozo Iizuka | 3 |
| Publication | Filing date | Title |
|---|---|---|
| AU2003275573A1 | Corner piece-less duct, method of producing the same, and duct-forming machine | |
| WO0184058A1 | Duct joint structure | |
| US6463961B1 | Duct hanger and method for hanging duct using hanger |