| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 114 | |
| #2 | Canada | 7 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Machines | |
| #3 | Engines, pumps and turbines | |
| #4 | Transport |
| # | Name | Total Patents |
|---|---|---|
| #1 | Christensen Niels A | 121 |
| Publication | Filing date | Title |
|---|---|---|
| US2654234A | Coupling | |
| US2625413A | Seal for hydraulic rams | |
| US2642087A | Valve mechanism | |
| US2509672A | Sealing device | |
| US2480633A | Cylinder and cylinder head construction | |
| US2509671A | Slide valve | |
| US2577999A | Reversing valve | |
| US2467370A | Pressure seal | |
| US2471933A | Sealing device | |
| US2459148A | Fluid control apparatus | |
| US2496036A | Reversing valve | |
| US2410808A | Pump | |
| US2414451A | Fluid control system | |
| US2501661A | Apparatus and system for fluid control | |
| US2406197A | Accumulator | |
| US2394364A | Pressure seal | |
| US2396155A | Hydraulic brake | |
| US2281138A | High pressure regulating control valve | |
| US2337738A | Double-acting shock brake | |
| US2290537A | Pressure boosting cylinder |