| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Austria | 4 | |
| #2 | Switzerland | 4 | |
| #3 | United Kingdom | 4 | |
| #4 | Germany | 1 | |
| #5 | France | 1 |
| # | Industry | |
|---|---|---|
| #1 | Engines, pumps and turbines | |
| #2 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Rotary-pistons | |
| #2 | Venting or aerating devices | |
| #3 | Gearing | |
| #4 | Rotary pistons | |
| #5 | Pistons and sealings |
| # | Name | Total Patents |
|---|---|---|
| #1 | Inc The Hill Compressor Pump C | 4 |
| Publication | Filing date | Title |
|---|---|---|
| DE445893C | Compressor with rotating pistons | |
| GB230241A | Improvements in or relating to rotary pumps or the like | |
| GB233265A | Improvements in or relating to rotary pumps or the like | |
| GB233423A | Improvements in or relating to rotary pumps or the like | |
| GB233064A | Improvements in or relating to rotary pumps or the like |