| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Canada | 21 | |
| #2 | United States | 17 | |
| #3 | Australia | 7 | |
| #4 | EPO (European Patent Office) | 5 | |
| #5 | South Africa | 3 | |
| #6 | Germany | 2 | |
| #7 | United Kingdom | 2 | |
| #8 | Brazil | 1 | |
| #9 | Netherlands | 1 | |
| #10 | Norway | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Mechanical elements | |
| #3 | Engines, pumps and turbines | |
| #4 | Machines | |
| #5 | Control |
| # | Name | Total Patents |
|---|---|---|
| #1 | Johnson Clarence William | 10 |
| #2 | Johnson Clarence W | 10 |
| #3 | Friedrich Jaromir | 6 |
| #4 | Ellett James R | 6 |
| #5 | Sturgeon Leonard A | 4 |
| #6 | Gray Gary D | 4 |
| #7 | Berthiaume Derek B | 3 |
| #8 | Krepela Josef | 3 |
| #9 | Ring Curtis P | 3 |
| #10 | Tomm Wayne R | 3 |
| Publication | Filing date | Title |
|---|---|---|
| US5070900A | Safety valve actuator assembly | |
| CA1317850C | Safety valve actuator assembly | |
| US4961560A | Two way latching trip valve | |
| CA1316899C | Isolator valve | |
| US4658917A | Enclosed jar tool | |
| EP0334389A2 | Wellhead seals | |
| DE3421081A1 | Impact tool | |
| CA1219855A | Floating cushion sub | |
| CA1208123A | Wellhead sealing system | |
| CA1195315A | Enclosed jar tool | |
| CA1190920A | Mobile drilling apparatus | |
| CA1249193A | Engine shutdown valve | |
| CA1222448A | Casing shoe | |
| CA1196573A | Casing hanger | |
| US4494778A | Casing hanger | |
| US4478284A | Jar tool | |
| CA1177058A | Jar tool | |
| US4391152A | Sampler | |
| CA1069494A | Floating cushion sub | |
| CA1044220A | Stabilizer with replaceable sub-assemblies |