| # | Country | Total Patents | |
|---|---|---|---|
| #1 | EPO (European Patent Office) | 2 | |
| #2 | Belgium | 1 | |
| #3 | Canada | 1 | |
| #4 | German Democratic Republic | 1 | |
| #5 | India | 1 | |
| #6 | Italy | 1 | |
| #7 | Japan | 1 | |
| #8 | Netherlands | 1 | |
| #9 | Portugal | 1 | |
| #10 | WIPO (World Intellectual Property Organization) | 1 |
| # | Industry | |
|---|---|---|
| #1 | Engines, pumps and turbines |
| # | Technology | |
|---|---|---|
| #1 | Cyclically operating valves | |
| #2 | Internal-combustion piston engines |
| # | Name | Total Patents |
|---|---|---|
| #1 | Hopkins Phillip Rodney | 4 |
| #2 | Hopkins Phillip R | 2 |
| #3 | Phillip Rodney Hopkins | 1 |
| #4 | Fuiritsupu Aaru Hopukinsu | 1 |
| Publication | Filing date | Title |
|---|---|---|
| WO8300722A1 | Rotary engine valve with improved seals and lubrication system | |
| IT7925950D0 | Rotary valve for IC engine | |
| DD146198A5 | Circular motor valve | |
| PT70141A | Rotary egine valve | |
| CA1153698A | Rotary engine valve |