| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 8 | |
| #2 | United Kingdom | 4 | |
| #3 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Mechanical elements | |
| #3 | Machine tools |
| # | Technology | |
|---|---|---|
| #1 | Hydraulic engineering | |
| #2 | Pipes | |
| #3 | Dredging | |
| #4 | Perforating | |
| #5 | Making metal sheets |
| # | Name | Total Patents |
|---|---|---|
| #1 | Willner Kurt | 8 |
| #2 | Kurt Willner | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB961188A | Improvements in or relating to tubular bodies and to a method of making the same | |
| GB866823A | Improvements in or relating to drain pipes | |
| GB836072A | Drain pipe | |
| US3031854A | Means for laying drainage material in the ground | |
| GB844269A | An implement for laying lengths of material in the ground |