| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 8 | |
| #2 | Australia | 3 | |
| #3 | Brazil | 2 | |
| #4 | Canada | 2 | |
| #5 | EPO (European Patent Office) | 2 | |
| #6 | Mexico | 2 | |
| #7 | Norway | 2 | |
| #8 | WIPO (World Intellectual Property Organization) | 2 |
| # | Industry | |
|---|---|---|
| #1 | Engines, pumps and turbines | |
| #2 | Civil engineering | |
| #3 | Packaging and shipping |
| # | Technology | |
|---|---|---|
| #1 | Pumps | |
| #2 | Earth drilling | |
| #3 | Rotary-pistons | |
| #4 | Positive-displacement engines | |
| #5 | Winches | |
| #6 | Cranes |
| # | Name | Total Patents |
|---|---|---|
| #1 | Birdwell J C | 22 |
| #2 | Birwell J C | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US4932005A | Fluid means for data transmission | |
| US4869100A | Variable orifice control means | |
| CA1275181C | Fluid means for data transmission | |
| AU5207486A | Mud pump | |
| US4676724A | Mud pump | |
| US4500267A | Mud pump | |
| US4541779A | Mud pump | |
| US4098359A | Hydraulically operated downhole motor | |
| US3861534A | Davit, particularly for marine use | |
| US3339460A | Pressure fluid motor |