| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Belgium | 3 | |
| #2 | Germany | 3 | |
| #3 | United States | 3 | |
| #4 | France | 1 | |
| #5 | United Kingdom | 1 | |
| #6 | Italy | 1 | |
| #7 | Sweden | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Engines, pumps and turbines |
| # | Technology | |
|---|---|---|
| #1 | Dredging | |
| #2 | Non-positive-displacement pumps | |
| #3 | Foundations and excavations |
| # | Name | Total Patents |
|---|---|---|
| #1 | Araoka Toshinobu | 7 |
| Publication | Filing date | Title |
|---|---|---|
| US3885330A | Excavator for digging a hole beneath the water | |
| US3945761A | Fan disturbing sand at the bottom of a body of water so that it may be pumped up efficiently | |
| GB1271749A | Apparatus for dredging up and sifting mud, sand or gravel |