Percy R. Helm
5Patents
5h-index
2Co-inventors
45Inventor score
Filing activity: Jun 13, 1974 → Aug 2, 1982
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4316548A | Concentric ring segment supported lift crane | Performing Operations; Transporting | 17 | Expired |
| US4358021A | Separated ring segment dual pivot lift crane | Emerging Cross-Sectional Technologies | 17 | Expired |
| US4601402A | Steerable concentric ring segment supported lift crane | Performing Operations; Transporting | 16 | Expired |
| US3977530A | Crane with gantry backhitch and boom hoist assembly removable as a unit | Performing Operations; Transporting | 15 | Expired |
| US4449635A | Imaginary pivot lift crane | Performing Operations; Transporting | 11 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.