| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 7 | |
| #2 | African Regional Industrial Property Organization | 3 | |
| #3 | WIPO (World Intellectual Property Organization) | 3 | |
| #4 | Canada | 2 | |
| #5 | China | 2 | |
| #6 | Republic of Korea | 2 | |
| #7 | Australia | 1 | |
| #8 | Brazil | 1 | |
| #9 | EPO (European Patent Office) | 1 | |
| #10 | Hong Kong | 1 | |
| #11 | Japan | 1 | |
| #12 | Morocco | 1 | |
| #13 | New Zealand | 1 |
| # | Industry | |
|---|---|---|
| #1 | Engines, pumps and turbines | |
| #2 | Environmental technology | |
| #3 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Machines for liquids | |
| #2 | Reduction of greenhouse gas emissions | |
| #3 | Special wind, spring and weight motors | |
| #4 | Pumps | |
| #5 | Hydraulic engineering |
| # | Name | Total Patents |
|---|---|---|
| #1 | Rothi Harold L | 22 |
| #2 | Rothi Curtis J | 22 |
| #3 | Welch Jr Kenneth W | 14 |
| #4 | Welch Kenneth W Jr | 7 |
| #5 | Welch Willard M Jr | 2 |
| #6 | Welch Jr Kenneth W Rothi Curti | 1 |
| #7 | Welch Kenneth W | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2006242954A1 | Buoyancy pump power system | |
| KR20070108362A | Buoyancy pump power system | |
| CN101137839A | Buoyancy pump power system | |
| CA2505634A1 | Buoyancy pump power system | |
| US6953328B2 | Buoyancy pump device |