Alexander Lifson
173Patents
28h-index
52Co-inventors
93Inventor score
Filing activity: Mar 6, 1995 → Jun 21, 2019
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6925823B2 | Refrigerant cycle with operating range extension | Emerging Cross-Sectional Technologies | 94 | Expired |
| US6474087B1 | Method and apparatus for the control of economizer circuit flow for optimum performance | Mechanical Engineering; Lighting; Heating | 93 | Expired |
| US6042344A | Control of scroll compressor at shutdown to prevent unpowered reverse rotation | Mechanical Engineering; Lighting; Heating | 74 | Expired |
| US6238188A | Compressor control at voltage and frequency extremes of power supply | Mechanical Engineering; Lighting; Heating | 73 | Expired |
| US5510582A | Acoustic attenuator, well logging apparatus and method of well logging | Emerging Cross-Sectional Technologies | 71 | Expired |
| US6047556A | Pulsed flow for capacity control | Mechanical Engineering; Lighting; Heating | 65 | Expired |
| US6981384B2 | Monitoring refrigerant charge | Mechanical Engineering; Lighting; Heating | 58 | Expired |
| US7228707B2 | Hybrid tandem compressor system with multiple evaporators and economizer circuit | Mechanical Engineering; Lighting; Heating | 57 | Expired |
| US5996364A | Scroll compressor with unloader valve between economizer and suction | Mechanical Engineering; Lighting; Heating | 55 | Expired |
| US6799951B2 | Compressor degradation detection system | Mechanical Engineering; Lighting; Heating | 52 | Expired |
| US6941770B1 | Hybrid reheat system with performance enhancement | Mechanical Engineering; Lighting; Heating | 51 | Expired |
| US7114349B2 | Refrigerant system with common economizer and liquid-suction heat exchanger | Mechanical Engineering; Lighting; Heating | 49 | Expired |
| US6694750B1 | Refrigeration system employing multiple economizer circuits | Mechanical Engineering; Lighting; Heating | 46 | Expired |
| US7059151B2 | Refrigerant systems with reheat and economizer | Mechanical Engineering; Lighting; Heating | 43 | Expired |
| US7343750B2 | Diagnosing a loss of refrigerant charge in a refrigerant system | Mechanical Engineering; Lighting; Heating | 43 | Expired |
| US6058729A | Method of optimizing cooling capacity, energy efficiency and reliability of a refrigeration system during temperature pull down | Mechanical Engineering; Lighting; Heating | 42 | Expired |
| US6571576B1 | Injection of liquid and vapor refrigerant through economizer ports | Mechanical Engineering; Lighting; Heating | 41 | Expired |
| US7325414B2 | Hybrid tandem compressor system with economizer circuit and reheat function for multi-level cooling | Mechanical Engineering; Lighting; Heating | 38 | Expired |
| US7272948B2 | Heat pump with reheat and economizer functions | Mechanical Engineering; Lighting; Heating | 38 | Expired |
| US7854137B2 | Variable speed compressor motor control for low speed operation | Emerging Cross-Sectional Technologies | 37 | Active |
| US7275384B2 | Heat pump with reheat circuit | Mechanical Engineering; Lighting; Heating | 36 | Expired |
| US7255542B2 | Compressor with check valve orientated at angle relative to discharge tube | Mechanical Engineering; Lighting; Heating | 35 | Expired |
| US7290399B2 | Multi-circuit dehumidification heat pump system | Mechanical Engineering; Lighting; Heating | 35 | Expired |
| US8235101B2 | Parallel flow heat exchanger for heat pump applications | Mechanical Engineering; Lighting; Heating | 34 | Active |
| US8079229B2 | Economized refrigerant vapor compression system for water heating | Mechanical Engineering; Lighting; Heating | 34 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.