| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 6 | |
| #2 | Canada | 4 | |
| #3 | EPO (European Patent Office) | 1 | |
| #4 | Finland | 1 | |
| #5 | Norway | 1 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Engines, pumps and turbines | |
| #3 | Machines | |
| #4 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Venting or aerating devices | |
| #2 | Earth drilling | |
| #3 | Controlling combustion engines | |
| #4 | Unspecified technologies | |
| #5 | Servomotors | |
| #6 | Internal-combustion piston engines | |
| #7 | Pumps |
| # | Name | Total Patents |
|---|---|---|
| #1 | Johnson Clarence William | 6 |
| #2 | Krepela Joseph | 4 |
| #3 | Johnson Clarence W | 1 |
| #4 | Ellet James R | 1 |
| #5 | Prysko Dean Stephen | 1 |
| Publication | Filing date | Title |
|---|---|---|
| CA2404747A1 | Improved engine shutdown valve | |
| US6116268A | Wellhead safety valve control system | |
| US6053711A | Pump for pressurizing control system | |
| US5971353A | Dump/stop valve for surface controlled subsurface safety valve | |
| CA1340380C | Isolator valve | |
| US6032921A | Engine shutdown valve | |
| CA2172477A1 | Dump/stop valve for surface controller subsurface safety valve | |
| US6015134A | Pneumatic actuator assembly |