| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 107 | |
| #2 | Canada | 12 | |
| #3 | Germany | 1 |
| # | Industry | |
|---|---|---|
| #1 | Engines, pumps and turbines | |
| #2 | Machines | |
| #3 | Environmental technology | |
| #4 | Mechanical elements | |
| #5 | Control |
| # | Name | Total Patents |
|---|---|---|
| #1 | Doble William A | 19 |
| #2 | Foulds Charles V | 17 |
| #3 | Henry George J Jr | 13 |
| #4 | Morgan White Ira | 12 |
| #5 | Hutchinson Ely C | 11 |
| #6 | Karnasch Leopold M | 7 |
| #7 | Quick Ray S | 7 |
| #8 | Orton Ernest W | 6 |
| #9 | Ray Bacchi | 6 |
| #10 | Rued Fred H | 4 |
| Publication | Filing date | Title |
|---|---|---|
| US2707938A | Governor hydraulic circuit controller | |
| US2728193A | Ram jack | |
| US2702025A | Pumping jack | |
| US2706996A | Free discharge valve | |
| US2650503A | Cone valve operator | |
| US2645237A | Governor head vibration dampener | |
| US2623395A | Cone valve operator | |
| US2565640A | Cone valve operator | |
| US2654221A | Pumping jack oil makeup and pressure control | |
| US2575241A | Hydraulic pumping jack | |
| US2566295A | Hydraulic pumping jack | |
| US2617256A | Hydraulic pumping jack control | |
| US2663538A | Spherical valve | |
| US2501984A | Shaft seal | |
| US2635847A | Turbine jet controller | |
| US2617622A | Axially movable rotary valve | |
| US2559336A | Draft tube valve | |
| US2582836A | Pumping jack | |
| US2590466A | Multistage sleeve valve | |
| US2575308A | Hydraulic jack |