| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Switzerland | 4 | |
| #2 | Germany | 4 | |
| #3 | Austria | 3 | |
| #4 | Finland | 3 | |
| #5 | United Kingdom | 3 | |
| #6 | Sweden | 3 | |
| #7 | Norway | 2 | |
| #8 | Belgium | 1 | |
| #9 | Denmark | 1 | |
| #10 | Spain | 1 | |
| #11 | France | 1 | |
| #12 | Netherlands | 1 |
| # | Industry | |
|---|---|---|
| #1 | Engines, pumps and turbines | |
| #2 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Non-positive-displacement pumps | |
| #2 | Special non-positive-displacement engines | |
| #3 | Pistons and sealings | |
| #4 | Pumps |
| # | Name | Total Patents |
|---|---|---|
| #1 | Pracht F | 6 |
| #2 | Pracht Friedrich | 5 |
| #3 | Friedrich Pracht | 4 |
| #4 | Denda H | 1 |
| #5 | Auchter Bruno Dipl Ing | 1 |
| #6 | Denda Helmut | 1 |
| #7 | Helmut Denda | 1 |
| #8 | Bruno Auchter Dipl-Ing | 1 |
| #9 | Auchter Dipl-Ing Bruno | 1 |
| Publication | Filing date | Title |
|---|---|---|
| DE2262017A1 | VERTICAL HANGING CENTRIFUGAL PUMP | |
| DE1946719A1 | centrifugal pump | |
| DE1255420B | Method for connecting the sliding ring of mechanical seals to the sliding ring holder | |
| DE1528888A1 | Single-suspension pump for aggressive media | |
| GB1024209A | Improvements in slip ring packings for shafts |