| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 5 | |
| #2 | Canada | 3 | |
| #3 | United Kingdom | 3 | |
| #4 | Netherlands | 3 | |
| #5 | Belgium | 2 | |
| #6 | France | 2 | |
| #7 | United States | 2 | |
| #8 | Denmark | 1 | |
| #9 | EPO (European Patent Office) | 1 | |
| #10 | Finland | 1 | |
| #11 | Norway | 1 | |
| #12 | Sweden | 1 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Chemical engineering | |
| #3 | Machines | |
| #4 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Venting or aerating devices | |
| #2 | Separation | |
| #3 | Unspecified technologies | |
| #4 | Machines for making railways |
| # | Name | Total Patents |
|---|---|---|
| #1 | Jacobs Christianus | 2 |
| #2 | Baas Hendrik B | 1 |
| #3 | Baas Hendrik Bernhard | 1 |
| #4 | Dierikx A P | 1 |
| #5 | Jacobs Christiaan | 1 |
| #6 | Visser Jan C | 1 |
| #7 | Dierikx Andreas P | 1 |
| #8 | Baas Hendrik Berhard | 1 |
| #9 | Visser J C | 1 |
| #10 | Jacobs C | 1 |
| Publication | Filing date | Title |
|---|---|---|
| EP0006640A1 | A butterfly valve | |
| DE2845223A1 | VALVE | |
| GB1601875A | Filter press | |
| CA1002927A | Butterfly valve | |
| DE2413910A1 | FLAP VALVE | |
| CA919152A | Gate valve | |
| DE1268920B | Gate valve without housing bag | |
| GB720854A | Improvements in and relating to rail chairs | |
| CA904245A | Gate valve |