| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Netherlands | 3 | |
| #2 | Australia | 1 | |
| #3 | Brazil | 1 | |
| #4 | Canada | 1 | |
| #5 | Denmark | 1 | |
| #6 | EPO (European Patent Office) | 1 | |
| #7 | Ireland | 1 | |
| #8 | Mexico | 1 | |
| #9 | Norway | 1 | |
| #10 | Portugal | 1 | |
| #11 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Chemical engineering | |
| #2 | Thermal processes |
| # | Technology | |
|---|---|---|
| #1 | Separation | |
| #2 | Air-conditioning |
| # | Name | Total Patents |
|---|---|---|
| #1 | Valkenburg Johannes | 8 |
| #2 | Weerden Jan Van | 5 |
| #3 | Spek Ferdinand Peter Van Der | 5 |
| #4 | Van Weerden Jan | 3 |
| #5 | Van Der Spek Ferdinand P | 1 |
| #6 | Johannes Valkenburg | 1 |
| #7 | Van Der Spek Ferdinand Peter | 1 |
| #8 | Jan Weerdn Van | 1 |
| #9 | Van Der Spek Ferdinand | 1 |
| Publication | Filing date | Title |
|---|---|---|
| NL8603315A | Plastic filter bag e.g. for paint filtration etc. under pressure - has plastic collar secured to open end and outward flange having elastomer perimeter ring | |
| NL8603316A | Filtration unit e.g. for paint - has plastic collar on plastic filter bag with sealing ring on outward flange and openings in opposed inward flanges | |
| NL8603306A | Air filter. |