Richard A. Schafer
6Patents
5h-index
9Co-inventors
56Inventor score
Filing activity: Dec 19, 1975 → Aug 21, 2002
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4216975A | Tractor hitch | Human Necessities | 27 | Expired |
| US4271910A | Draft sensing device including load pin with free end | Human Necessities | 13 | Expired |
| US6701277B2 | Elevator car position sensing system | Performing Operations; Transporting | 12 | Expired |
| US4397359A | Tractor hitch with yoke having pivotally supported upper end | Human Necessities | 12 | Expired |
| US4008906A | Ball coupling | Mechanical Engineering; Lighting; Heating | 6 | Expired |
| US4219212A | Tractor implement hitch | Human Necessities | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.