| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Canada | 7 | |
| #2 | United Kingdom | 4 | |
| #3 | United States | 4 | |
| #4 | Switzerland | 3 | |
| #5 | Spain | 3 |
| # | Industry | |
|---|---|---|
| #1 | Engines, pumps and turbines |
| # | Technology | |
|---|---|---|
| #1 | Rotary-pistons | |
| #2 | Internal-combustion piston engines | |
| #3 | Rotary pistons |
| # | Name | Total Patents |
|---|---|---|
| #1 | Friend John Edward | 15 |
| #2 | John Edward Friend | 4 |
| Publication | Filing date | Title |
|---|---|---|
| GB190720111A | An Improved Rotary Steam Engine. | |
| CA110399A | Rotary steam engine | |
| US902225A | Rotary engine. | |
| GB190718476A | An Improved Rotary Gas Engine. | |
| CA114548A | Rotary gas engine | |
| US913635A | Rotary gas-engine. | |
| GB190711789A | Improvements in Rotary Steam Engines. | |
| CA110680A | Rotary steam engine | |
| US935101A | Rotary steam-engine. | |
| US854574A | Rotary engine. | |
| CA104106A | Rotary engine | |
| GB190700886A | Improvements in Rotary Engines. | |
| CA55029A | Steam boiler | |
| CA55440A | Hydro-carbon motor | |
| CA43896A | Hydro-carbon motor |