Roy Campbell
24Patents
8h-index
11Co-inventors
72Inventor score
Filing activity: Aug 22, 1974 → Nov 3, 2016
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4036210A | Double lumened catheter | Human Necessities | 50 | Expired |
| US4913267A | Vehicle disc brakes of the liquid cooled type | Mechanical Engineering; Lighting; Heating | 37 | Expired |
| US5012901A | Self-energizing disc brakes | Mechanical Engineering; Lighting; Heating | 20 | Expired |
| US3952843A | Spreading disc brake and cam actuator therefor | Mechanical Engineering; Lighting; Heating | 18 | Expired |
| US4653614A | Self-energizing disc brakes | Mechanical Engineering; Lighting; Heating | 18 | Expired |
| US4883149A | Vehicle disc brakes of the liquid cooled type | Mechanical Engineering; Lighting; Heating | 9 | Expired |
| US4550810A | Disc brakes for vehicles | Mechanical Engineering; Lighting; Heating | 9 | Expired |
| US4547967A | Vehicle hydraulic braking system | Performing Operations; Transporting | 8 | Expired |
| US4685541A | Self-energizing disc brakes | Mechanical Engineering; Lighting; Heating | 5 | Expired |
| US4736820A | Self-energizing disc brakes | Mechanical Engineering; Lighting; Heating | 5 | Expired |
| US4702351A | Self-energizing disc brakes | Emerging Cross-Sectional Technologies | 4 | Expired |
| US4862998A | Self-energizing disc brakes | Mechanical Engineering; Lighting; Heating | 3 | Expired |
| US4676345A | Self-energizing disc brakes | Mechanical Engineering; Lighting; Heating | 2 | Expired |
| US4787482A | Self energizing disc brakes | Mechanical Engineering; Lighting; Heating | 2 | Expired |
| US4865168A | Vehicle disc brakes of the liquid cooled type | Mechanical Engineering; Lighting; Heating | 2 | Expired |
| USD808043S1 | Paver | General | 2 | Active |
| US4488405A | Master cylinder assembly for a vehicle hydraulic braking system | Performing Operations; Transporting | 2 | Expired |
| US4768624A | Self-energizing disc brakes with cable assembly and cable casing therefor | Mechanical Engineering; Lighting; Heating | 2 | Expired |
| US4768625A | Self-energizing disc brakes | Mechanical Engineering; Lighting; Heating | 2 | Expired |
| US4884494A | Pressure cylinder | Performing Operations; Transporting | 1 | Expired |
| US4711327A | Self-energizing disc brakes | Mechanical Engineering; Lighting; Heating | 1 | Expired |
| US4796730A | Self-energizing disc brakes | Mechanical Engineering; Lighting; Heating | 0 | Expired |
| US4703836A | Self-energising disc brakes with links of different lengths | Mechanical Engineering; Lighting; Heating | 0 | Expired |
| US4809588A | Hydraulic piston and cylinder assemblies | Mechanical Engineering; Lighting; Heating | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.