| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Norway | 6 | |
| #2 | WIPO (World Intellectual Property Organization) | 6 | |
| #3 | EPO (European Patent Office) | 5 | |
| #4 | Canada | 4 | |
| #5 | United States | 4 | |
| #6 | China | 1 | |
| #7 | Denmark | 1 | |
| #8 | Spain | 1 | |
| #9 | Hong Kong | 1 | |
| #10 | Israel | 1 | |
| #11 | African Intellectual Property Organization | 1 |
| # | Industry | |
|---|---|---|
| #1 | Engines, pumps and turbines | |
| #2 | Mechanical elements | |
| #3 | Thermal processes | |
| #4 | Chemical engineering |
| # | Technology | |
|---|---|---|
| #1 | Siphons | |
| #2 | Servomotors | |
| #3 | Heat-exchanger without contact | |
| #4 | Compressed gas holders | |
| #5 | Heat-exchange device details | |
| #6 | Internal-combustion piston engines | |
| #7 | Pumps | |
| #8 | Separation |
| # | Name | Total Patents |
|---|---|---|
| #1 | Hauge Leif J | 28 |
| #2 | Hauge Leif J Lj | 1 |
| Publication | Filing date | Title |
|---|---|---|
| WO2014172576A1 | Rotor positioning system in a pressure exchange vessel | |
| CN103339433A | Split pressure vessel for two flow processing | |
| EP1019636A1 | Pressure exchanger | |
| NO944558D0 | Pressure Switches | |
| NO894392D0 | PRESS CHANGER. | |
| ES2008947A6 | Pressure exchanger for liquids - consists of inlet and outlet ducts forming pairs of ducts on sides | |
| US4887942A | Pressure exchanger for liquids |