Frank E. Wills
22Patents
15h-index
10Co-inventors
78Inventor score
Filing activity: Dec 5, 1975 → Feb 27, 2004
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4146085A | Diagnostic system for heat pump | Emerging Cross-Sectional Technologies | 101 | Expired |
| US5252905A | Driving system for single phase A-C induction motor | Electricity | 71 | Expired |
| US5218283A | AC motor drive system with a two phase power supply | Electricity | 61 | Expired |
| US6121749A | Variable-speed drive for single-phase motors | Electricity | 61 | Expired |
| US4706180A | Pulse width modulated inverter system for driving single phase a-c induction motor | Electricity | 51 | Expired |
| US7096681B2 | System and method for variable speed operation of a screw compressor | Emerging Cross-Sectional Technologies | 35 | Expired |
| US4425539A | Control system for AC induction motor | Electricity | 34 | Expired |
| US5460009A | Refrigeration system and method | Emerging Cross-Sectional Technologies | 32 | Expired |
| US5136216A | AC motor drive system | Electricity | 30 | Expired |
| US5555736A | Refrigeration system and method | Emerging Cross-Sectional Technologies | 27 | Expired |
| US4651079A | Pulse width modulated inverter system for driving single phase a-c induction motor at a constant voltage/frequency ratio | Electricity | 26 | Expired |
| US4102389A | Heat pump control system | Mechanical Engineering; Lighting; Heating | 24 | Expired |
| US5146147A | AC motor drive system | Electricity | 21 | Expired |
| US4078393A | Control system for controlling the operation of a three-phase load | Electricity | 21 | Expired |
| US4075865A | Apparatus for controlling condenser pressure in a refrigeration system | Emerging Cross-Sectional Technologies | 19 | Expired |
| US4499534A | Control system for controlling an SCR network to regulate three-phase A-C power flow | Electricity | 14 | Expired |
| US5898554A | Switch driver circuit | Electricity | 14 | Expired |
| US5075838A | Energy efficient voltage snubber circuit | Emerging Cross-Sectional Technologies | 13 | Expired |
| US5838144A | Solid state, reduced voltage motor starter enabling equalized input/output volt-amp ratings | Electricity | 11 | Expired |
| US7075268B2 | System and method for increasing output horsepower and efficiency in a motor | Electricity | 9 | Expired |
| US4864487A | Control for three terminal power semiconductor devices | Electricity | 4 | Expired |
| US4146920A | Pre-charge circuit for aux-comm inverter | Electricity | 3 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.