| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 4 | |
| #2 | Germany | 3 | |
| #3 | France | 3 | |
| #4 | United Kingdom | 3 | |
| #5 | Austria | 2 | |
| #6 | Canada | 1 |
| # | Industry | |
|---|---|---|
| #1 | Engines, pumps and turbines | |
| #2 | Mechanical elements | |
| #3 | Machine tools |
| # | Technology | |
|---|---|---|
| #1 | Rotary-pistons | |
| #2 | Positive-displacement engines | |
| #3 | Gearing | |
| #4 | Grinding or polishing devices | |
| #5 | Clutches and brakes | |
| #6 | Rotary pistons |
| # | Name | Total Patents |
|---|---|---|
| #1 | Hartmann Philip | 6 |
| #2 | Philip Hartmann | 3 |
| #3 | Brand George W | 2 |
| #4 | Brand George William | 2 |
| #5 | W Brand George | 1 |
| #6 | Brekelbaum Erwin C | 1 |
| #7 | Hartmann Richard A | 1 |
| #8 | Bowman Spencer | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US3221665A | Hydraulic pump or motor with hydraulic pressure-responsive vane | |
| FR1382139A | Hydrodynamic assembly to convert fluid pressure into rotational motion | |
| GB1016345A | Improvements in rotary hydraulic motors | |
| FR1342713A | Variable volume pump | |
| US3187676A | Reversible variable volume pump | |
| US3180271A | Variable volume pump | |
| FR1281676A | Fluid pump or motor with pressure balancing device | |
| GB948078A | Fluid pump or motor with fluid pressure balancing means | |
| US1467380A | Universal joint | |
| CA707159A | Hydrodynamic unit |