| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Netherlands | 6 | |
| #2 | EPO (European Patent Office) | 4 | |
| #3 | Canada | 2 | |
| #4 | United States | 2 | |
| #5 | Australia | 1 | |
| #6 | Brazil | 1 | |
| #7 | Colombia | 1 | |
| #8 | Czechia | 1 | |
| #9 | Finland | 1 | |
| #10 | Hungary | 1 | |
| #11 | Israel | 1 | |
| #12 | Japan | 1 | |
| #13 | Republic of Korea | 1 | |
| #14 | Norway | 1 | |
| #15 | New Zealand | 1 | |
| #16 | Poland | 1 | |
| #17 | Turkey | 1 | |
| #18 | Taiwan | 1 | |
| #19 | WIPO (World Intellectual Property Organization) | 1 | |
| #20 | South Africa | 1 |
| # | Industry | |
|---|---|---|
| #1 | Machines | |
| #2 | Mechanical elements | |
| #3 | Machine tools | |
| #4 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Pipes | |
| #2 | Shaping of plastics | |
| #3 | Punching metal | |
| #4 | Unspecified technologies | |
| #5 | Producing goods from plastic | |
| #6 | Sewers | |
| #7 | Shaping clay | |
| #8 | Foundations and excavations |
| # | Name | Total Patents |
|---|---|---|
| #1 | Wulff Frederik Karel Albert | 9 |
| #2 | Wulff Frederik K A | 3 |
| #3 | Leeuwenburg Ewout | 3 |
| #4 | Nowack Reinhard | 2 |
| #5 | Van Kooij Robert Justus | 2 |
| #6 | Bakker Dick | 2 |
| #7 | Wulff Federik Karel Albert | 1 |
| #8 | Quak Hans | 1 |
| #9 | Wulf Frederik Karel Albert | 1 |
| #10 | Urufu Furederitsuku Kareru Aru | 1 |
| Publication | Filing date | Title |
|---|---|---|
| EP3015250A1 | Connection system | |
| NL1004099C2 | Pipe connection system and method for establishing a pipe connection running at an angle in the wall of a pipe. | |
| NL1004090C2 | The manufacture of plastic drain inspection hoppers | |
| NL1002923C2 | Device with coupling means for attaching a pipe or the like to it. | |
| TW328060B | A method and a device for jointing at least two plastic elements in a liquid- and/or gastight manner | |
| NL9301914A | Method and device for fluidly and / or gas-tightly connecting at least two plastic elements. | |
| NL9000881A | Seal for use with a pipe coupling. |