| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 4 | |
| #2 | Netherlands | 4 | |
| #3 | Canada | 3 | |
| #4 | France | 3 | |
| #5 | Norway | 3 | |
| #6 | United States | 3 | |
| #7 | Australia | 2 | |
| #8 | United Kingdom | 2 | |
| #9 | Ireland | 2 | |
| #10 | Japan | 2 | |
| #11 | Sweden | 2 | |
| #12 | German Democratic Republic | 1 | |
| #13 | Spain | 1 | |
| #14 | India | 1 | |
| #15 | New Zealand | 1 |
| # | Industry | |
|---|---|---|
| #1 | Transport |
| # | Technology | |
|---|---|---|
| #1 | Ships |
| # | Name | Total Patents |
|---|---|---|
| #1 | Werff Bartele Van Der | 9 |
| #2 | Van Der Werff Bartele | 6 |
| #3 | Van Der Werff B | 2 |
| #4 | Werff B Van Der | 2 |
| #5 | Vander Werff Bartele | 1 |
| #6 | Barutere Fuan Deru Uerufu | 1 |
| #7 | Baruteru Fuan Deru Uerufu | 1 |
| Publication | Filing date | Title |
|---|---|---|
| NZ183280A | Hopper barge with bottom discharge and suction discharge | |
| CA1038700A | Hopper barge having a bottom discharge opening closed by hopper doors | |
| IE39692L | Bottom-dump vessel | |
| IE39348L | Improvements in or relating to bottom-dump vessels | |
| AU4604272A | Improvements in or relating toa hopper barge |