Robert D. Keller
44Patents
13h-index
40Co-inventors
81Inventor score
Filing activity: Mar 24, 1983 → Feb 21, 2023
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4613415A | Electrolytic chlorine and alkali generator for swimming pools and method | Chemistry; Metallurgy | 48 | Expired |
| US8327750B2 | Valvetrain oil control system and oil control valve | Emerging Cross-Sectional Technologies | 43 | Active |
| US8534182B2 | Valvetrain oil control system and oil control valve | Emerging Cross-Sectional Technologies | 41 | Active |
| US6204582A | Servo motor assembly and method of making same | Electricity | 24 | Expired |
| US5250921A | Field assembly for an electromagnet | Mechanical Engineering; Lighting; Heating | 23 | Expired |
| US6593027B1 | Combination battery cover, heat shield and hold down | Emerging Cross-Sectional Technologies | 22 | Expired |
| USD706390S1 | Fuel tank isolation valve | General | 19 | Active |
| US6276664A | Worm driving a servo actuator with spring return and rotary valve employing same | Mechanical Engineering; Lighting; Heating | 19 | Expired |
| USD728746S1 | Fuel tank isolation valve | General | 17 | Active |
| US6219903A | Solenoid assembly with high-flux C-frame and method of making same | Emerging Cross-Sectional Technologies | 15 | Expired |
| USD728747S1 | Fuel tank isolation valve | General | 14 | Active |
| USD706389S1 | Fuel tank isolation valve | General | 13 | Active |
| USD747784S1 | Fuel tank isolation valve | General | 13 | Active |
| USD829304S1 | Valve carriage | General | 10 | Active |
| US6254058A | Spring returning a rotary valve with a differential planetary drive | Mechanical Engineering; Lighting; Heating | 9 | Expired |
| US6666178B1 | Valve deactivation with an electro-hydraulic actuator | Mechanical Engineering; Lighting; Heating | 8 | Expired |
| USD750746S1 | Fuel tank isolation valve | General | 8 | Active |
| US8844561B2 | Isolation valve with integrated sensor | Emerging Cross-Sectional Technologies | 8 | Active |
| US8196466B2 | Sensor for inductive measure of fluid level | Physics | 6 | Active |
| US7921703B2 | Integrated oil condition and level sensor | Mechanical Engineering; Lighting; Heating | 5 | Active |
| US10006740B1 | Sight assembly for firearms | Mechanical Engineering; Lighting; Heating | 5 | Active |
| US8459218B2 | Adjustable-stroke solenoid valve | Emerging Cross-Sectional Technologies | 5 | Active |
| US8316888B2 | Fluid-biased hydraulic control valve | Emerging Cross-Sectional Technologies | 3 | Active |
| US9022067B2 | Dual variable valve solenoid module | Emerging Cross-Sectional Technologies | 3 | Active |
| US8302570B2 | Oil control valve assembly for engine cam switching | Mechanical Engineering; Lighting; Heating | 2 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.