| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Netherlands | 2 | |
| #2 | Austria | 1 | |
| #3 | Switzerland | 1 | |
| #4 | Germany | 1 | |
| #5 | Denmark | 1 | |
| #6 | Finland | 1 | |
| #7 | France | 1 | |
| #8 | United Kingdom | 1 | |
| #9 | Italy | 1 | |
| #10 | Norway | 1 | |
| #11 | Sweden | 1 |
| # | Industry | |
|---|---|---|
| #1 | Engines, pumps and turbines | |
| #2 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Non-positive-displacement pumps | |
| #2 | Pistons and sealings |
| # | Name | Total Patents |
|---|---|---|
| #1 | Pracht Friedrich | 4 |
| #2 | Denda Helmut | 4 |
| #3 | Denda H | 2 |
| #4 | Pracht F | 2 |
| Publication | Filing date | Title |
|---|---|---|
| DE2615743A1 | MECHANICAL SEAL FOR THE SHAFT OF CENTRIFUGAL MACHINES, IN PARTICULAR CENTRIFUGAL PUMPS |