| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Netherlands | 4 | |
| #2 | Germany | 3 | |
| #3 | France | 3 | |
| #4 | Belgium | 2 | |
| #5 | Canada | 2 | |
| #6 | Denmark | 2 | |
| #7 | United Kingdom | 2 | |
| #8 | Australia | 1 | |
| #9 | Italy | 1 | |
| #10 | Norway | 1 | |
| #11 | United States | 1 | |
| #12 | South Africa | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Transport | |
| #3 | Mechanical elements | |
| #4 | Organic fine chemistry | |
| #5 | Materials and metallurgy | |
| #6 | Chemical engineering | |
| #7 | Environmental technology |
| # | Name | Total Patents |
|---|---|---|
| #1 | Groothuizen Albertus Gerardus | 5 |
| #2 | Nijdam Ate | 2 |
| #3 | Nijdam A | 2 |
| #4 | Nijdam Ir A | 1 |
| #5 | Groothuizen Albertus G M | 1 |
| #6 | Nijdam I | 1 |
| Publication | Filing date | Title |
|---|---|---|
| AU8340182A | Unloading chute for vessels | |
| NL8101171A | Filter mattress to stabilise bed of water-course - has water-permeable sheets connected via coupling elements with sand-filled space between | |
| NL169911B | Zinc piece with fixed ballast. | |
| NL7109290A | Method for manufacturing zinc pieces |