| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Netherlands | 6 | |
| #2 | Germany | 2 | |
| #3 | France | 2 | |
| #4 | United Kingdom | 2 | |
| #5 | Norway | 2 | |
| #6 | Belgium | 1 | |
| #7 | Canada | 1 | |
| #8 | Denmark | 1 | |
| #9 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Audio-visual technology |
| # | Technology | |
|---|---|---|
| #1 | Hydraulic engineering | |
| #2 | Television |
| # | Name | Total Patents |
|---|---|---|
| #1 | Boer Jan De | 2 |
| #2 | De Boer Jan | 2 |
| #3 | Boer J De | 2 |
| #4 | Zink N V Maatschappij Tot Uitv | 1 |
| #5 | Boer J D | 1 |
| Publication | Filing date | Title |
|---|---|---|
| NL7804491A | Sunken mattress for waterway construction - forms troughs from top and bottom sheets filled with ballast after which they are closed | |
| NL7804490A | Waterway construction plastics sheet securing system - uses pins with heads thrusting material apart, and transverse stop faces at rear | |
| US3983705A | Apparatus for forming a bottom protection | |
| NL7402727A | Immersed beam for sea bottom installation - has parallel rows of compartments with base flaps folded in groups selectively out of way | |
| DE2345385A1 | SINKSTUECK |