| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 8 | |
| #2 | Belgium | 2 | |
| #3 | Netherlands | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Transport |
| # | Technology | |
|---|---|---|
| #1 | Hydraulic engineering | |
| #2 | Platform constructions | |
| #3 | Motor vehicles |
| # | Name | Total Patents |
|---|---|---|
| #1 | Pfeifenbring Claus | 8 |
| Publication | Filing date | Title |
|---|---|---|
| DE3714585A1 | Retaining arrangement for a watercourse | |
| DE3508394A1 | Invert and structure formed therefrom | |
| DE1634138A1 | Concrete bulkhead |