Roger Willis
8Patents
3h-index
20Co-inventors
57Inventor score
Filing activity: Feb 12, 1979 → Nov 3, 2014
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5040003A | Method and apparatus for recording color with plural printheads | Physics | 44 | Expired |
| US4204140A | Safety circuit for electronic flash apparatus | Electricity | 5 | Expired |
| US5680167A | Printing apparatus and method for tri-level color imaging | Electricity | 3 | Expired |
| US4893926A | Focusing for optical print heads | Physics | 3 | Expired |
| US9617995B2 | Rotary piston pump with slip ring seals for improved fitting and synchronization of rotary pistons | Mechanical Engineering; Lighting; Heating | 1 | Active |
| US9028233B2 | Rotary piston pump and method for operating a rotary piston pump | Mechanical Engineering; Lighting; Heating | 0 | Active |
| US9617992B2 | Rotary piston pump with optimised inlets and outlets | Mechanical Engineering; Lighting; Heating | 0 | Active |
| US9611850B2 | Method and device for fixing and synchronizing rotary pistons in a rotary piston pump | Emerging Cross-Sectional Technologies | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.