| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 7 | |
| #2 | United Kingdom | 4 | |
| #3 | Canada | 2 | |
| #4 | France | 1 |
| # | Industry | |
|---|---|---|
| #1 | Engines, pumps and turbines | |
| #2 | Measurement | |
| #3 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Rotary-pistons | |
| #2 | Non-positive-displacement pumps | |
| #3 | Pistons and sealings | |
| #4 | Rotary pistons | |
| #5 | Measuring volume |
| # | Name | Total Patents |
|---|---|---|
| #1 | Houghton Carl R | 3 |
| #2 | Brady Francis E | 2 |
| #3 | Rathman Gilbert | 1 |
| #4 | Gilbert Rathman | 1 |
| #5 | Owens Robert H | 1 |
| #6 | Hassler Ernest C | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB670396A | Improvements in or relating to adjustable port arrangement for the high pressure ends of fluid pumps and motors of the rotary screw type | |
| GB670395A | Improvements in or relating to rotary screw-pumps and motors | |
| GB650606A | Improvements in or relating to fluid screw-compressors or motors | |
| GB625490A | Improvements in or relating to pumps of the rotary displacement type | |
| US2489887A | Rotary pump | |
| US2460310A | Screw pump | |
| US2185338A | Fluid handling apparatus | |
| US2188752A | Fluid handling apparatus | |
| US2217211A | Rotary pump | |
| US2156161A | Sealing device | |
| US2042499A | Rotary pump | |
| CA470400A | Screw pumps | |
| CA458637A | Rotary pump |