| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Netherlands | 4 | |
| #2 | United States | 3 | |
| #3 | EPO (European Patent Office) | 2 | |
| #4 | United Kingdom | 2 | |
| #5 | WIPO (World Intellectual Property Organization) | 2 | |
| #6 | Australia | 1 | |
| #7 | China | 1 | |
| #8 | Germany | 1 | |
| #9 | France | 1 | |
| #10 | Japan | 1 |
| # | Industry | |
|---|---|---|
| #1 | Engines, pumps and turbines | |
| #2 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Non-positive-displacement pumps | |
| #2 | Steam turbines | |
| #3 | Shaping of plastics | |
| #4 | Certain plastics |
| # | Name | Total Patents |
|---|---|---|
| #1 | Spek Hendrik Fedde Van Der | 6 |
| #2 | Olthof Henricus Johannes Berna | 4 |
| #3 | Olthof Henricus Johannes Bernh | 4 |
| #4 | Cipelletti Giorgio Roberto | 4 |
| #5 | Van Der Spek Hendrik Fedde | 3 |
| #6 | Fedde Der Spek Hendrik Van | 1 |
| #7 | Ackthun Normann Ernst Gustav | 1 |
| #8 | Fedde Van Der Spek Hendrik | 1 |
| #9 | Olthof Henricus | 1 |
| #10 | Roberto Cipelletti Giorgio | 1 |
| Publication | Filing date | Title |
|---|---|---|
| NL1022084C2 | Rotor with flexible blades for e.g. fans, has blade stops formed by springs between hub and blades | |
| US2004018090A1 | Rotor blade with a reduced tip | |
| WO02059484A1 | Fan blade with accelerated twist angle | |
| NL1019834C2 | Ventilation fan, especially for industrial use, has fan blades arranged in rotation planes positioned one on top of the other | |
| NL1019437C2 | Fan rotor blade with flap, has flap section with cross section defining two different angle geometry regions | |
| NL1014013C2 | Housing part for a fan impeller. | |
| GB9514763D0 | Fan blade manufacture by rotational moulding and a radial fan hub |