Keiichi Kitamura
20Patents
9h-index
42Co-inventors
75Inventor score
Filing activity: Mar 15, 1989 → Aug 20, 2020
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6316983A | Predistortion circuit | Electricity | 48 | Expired |
| US4998413A | Refrigerant recovery system | Mechanical Engineering; Lighting; Heating | 27 | Expired |
| US5448899A | Refrigerant evaporator | Mechanical Engineering; Lighting; Heating | 22 | Expired |
| US5376898A | Semiconductor integrated circuit device | Electricity | 16 | Expired |
| US8749204B2 | Battery condition detector, battery pack including same, and battery condition detecting method | Emerging Cross-Sectional Technologies | 16 | Active |
| US6708512B2 | Vehicle air conditioner with cold accumulator | Emerging Cross-Sectional Technologies | 14 | Expired |
| US6857286B2 | Vapor-compression refrigerant cycle system | Mechanical Engineering; Lighting; Heating | 14 | Expired |
| US4968904A | MESFET circuit with threshold-compensated source-follower output | Electricity | 12 | Expired |
| US6345647B2 | Fluid-impermeable composite hose | Emerging Cross-Sectional Technologies | 9 | Expired |
| US7121103B2 | Vehicle air conditioning system | Mechanical Engineering; Lighting; Heating | 9 | Expired |
| US5301520A | Water removing device in refrigerating system | Mechanical Engineering; Lighting; Heating | 8 | Expired |
| US6439268B2 | Fluid-impermeable composite hose | Emerging Cross-Sectional Technologies | 7 | Expired |
| US5490397A | Water removing device in refrigerating system | Mechanical Engineering; Lighting; Heating | 7 | Expired |
| US7040117B2 | Gas-liquid separator and ejector refrigerant cycle using the same | Mechanical Engineering; Lighting; Heating | 6 | Expired |
| US9523518B2 | Refrigeration cycle device | Mechanical Engineering; Lighting; Heating | 4 | Active |
| US5367883A | Refrigeration system | Mechanical Engineering; Lighting; Heating | 3 | Expired |
| US6640568B2 | Vehicle air conditioner with arrangement of temperature detector | Mechanical Engineering; Lighting; Heating | 2 | Expired |
| US5359862A | Method and apparatus for detecting an amount of cooling medium charged in a refrigeration circulation system | Mechanical Engineering; Lighting; Heating | 0 | Expired |
| US6530239B2 | Refrigeration system | Emerging Cross-Sectional Technologies | 0 | Expired |
| US12213376B2 | Organic photoelectric conversion material | Emerging Cross-Sectional Technologies | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.