| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Sweden | 9 | |
| #2 | WIPO (World Intellectual Property Organization) | 3 | |
| #3 | EPO (European Patent Office) | 2 | |
| #4 | United States | 2 | |
| #5 | Canada | 1 | |
| #6 | United Kingdom | 1 | |
| #7 | Norway | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Machines | |
| #3 | Mechanical elements | |
| #4 | Transport |
| # | Technology | |
|---|---|---|
| #1 | Dredging | |
| #2 | Unspecified technologies | |
| #3 | Pipes | |
| #4 | Wing fittings | |
| #5 | Marine propulsion | |
| #6 | Locks |
| # | Name | Total Patents |
|---|---|---|
| #1 | Hulden Fritiof | 18 |
| #2 | Huldén Fritiof | 1 |
| Publication | Filing date | Title |
|---|---|---|
| SE1751133A1 | Door opener | |
| WO9733120A1 | Quick coupling with pressure equalizing members in each of the pipe end fittings | |
| CA1314909C | Quick coupling means for a working implement of an excavating machine | |
| US4944628A | Quick coupling means for a working implement of an excavating machine | |
| WO8402152A1 | A coupling means |