John D. Petro
9Patents
4h-index
2Co-inventors
43Inventor score
Filing activity: Dec 16, 1976 → May 18, 1987
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4682939A | Gear pump or motor with tooth tips of dissimilar metal | Mechanical Engineering; Lighting; Heating | 32 | Expired |
| US4777981A | Magnetic detent joy stick and stack remote control valves | Emerging Cross-Sectional Technologies | 22 | Expired |
| US4187877A | Compensated work port fluid valves | Emerging Cross-Sectional Technologies | 15 | Expired |
| US4519419A | Hydraulic valves | Emerging Cross-Sectional Technologies | 6 | Expired |
| US4058135A | Compensated work port fluid valves and work port compensators | Emerging Cross-Sectional Technologies | 4 | Expired |
| US4519420A | Hydraulic valves | Emerging Cross-Sectional Technologies | 4 | Expired |
| US4569367A | Hydraulic valve inlet unloaders | Emerging Cross-Sectional Technologies | 3 | Expired |
| US4194366A | Two speed valves and bi-directional motor system | Emerging Cross-Sectional Technologies | 2 | Expired |
| US4338962A | Control and relief valves | Emerging Cross-Sectional Technologies | 1 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.