| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Republic of Korea | 4 | |
| #2 | WIPO (World Intellectual Property Organization) | 3 | |
| #3 | Australia | 1 | |
| #4 | China | 1 | |
| #5 | EPO (European Patent Office) | 1 | |
| #6 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Transport | |
| #2 | Machine tools | |
| #3 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Wheelchairs and sledges | |
| #2 | Gearing | |
| #3 | Making gears or toothed racks | |
| #4 | Air-cushion vehicles | |
| #5 | Marine propulsion | |
| #6 | Thread cutting | |
| #7 | Aeroplanes | |
| #8 | Milling |
| # | Name | Total Patents |
|---|---|---|
| #1 | Hwang Chil-Sung | 6 |
| #2 | Hwang Chil Seong | 4 |
| Publication | Filing date | Title |
|---|---|---|
| KR20040101727A | Pipe type impeller propeller member for water surface shifter | |
| KR20040099052A | A device for formming tooth form of spraket gear for power transmission apparatus of chainless bicycle | |
| KR20040091351A | The moment of aforce transmission apparatus for bicycle | |
| KR20030047677A | Gear member for power transmission |