| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 4 | |
| #2 | Canada | 2 | |
| #3 | EPO (European Patent Office) | 2 | |
| #4 | United States | 2 | |
| #5 | South Africa | 2 | |
| #6 | Australia | 1 | |
| #7 | Brazil | 1 | |
| #8 | China | 1 | |
| #9 | Norway | 1 | |
| #10 | WIPO (World Intellectual Property Organization) | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Machines | |
| #3 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Dredging | |
| #2 | Unspecified technologies | |
| #3 | Pipes |
| # | Name | Total Patents |
|---|---|---|
| #1 | Lehnhoff Peter Alexander | 10 |
| #2 | Walter Karl-Heinz | 5 |
| #3 | Lehnhoff Peter A | 2 |
| #4 | Mannbro Rolf | 1 |
| Publication | Filing date | Title |
|---|---|---|
| DE102004054058B3 | Hydraulic coupling with cleaning device | |
| DE102004014823A1 | Quick coupling device on a construction device with valve centering | |
| DE4214569C1 | Quick change device | |
| DE3444563A1 | EXCAVATOR TOOTH ARRANGEMENT |