Yukihiro Yamashita
76Patents
20h-index
63Co-inventors
91Inventor score
Filing activity: Jan 26, 1993 → Feb 6, 2019
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5570574A | Air-fuel ratio control system for internal combustion engine | Mechanical Engineering; Lighting; Heating | 74 | Expired |
| US5622047A | Method and apparatus for detecting saturation gas amount absorbed by catalytic converter | Emerging Cross-Sectional Technologies | 71 | Expired |
| US6898927B2 | Emission control system with catalyst warm-up speeding control | Emerging Cross-Sectional Technologies | 57 | Expired |
| US6244046A | Engine exhaust purification system and method having NOx occluding and reducing catalyst | Mechanical Engineering; Lighting; Heating | 52 | Expired |
| US5672817A | Self-diagnostic apparatus of air-fuel ratio control system of internal combustion engine | Mechanical Engineering; Lighting; Heating | 46 | Expired |
| US6148612A | Engine exhaust gas control system having NOx catalyst | Mechanical Engineering; Lighting; Heating | 42 | Expired |
| US5709198A | Oxygen concentration detecting apparatus | Mechanical Engineering; Lighting; Heating | 38 | Expired |
| US5719778A | Heater control apparatus for oxygen sensor | Physics | 36 | Expired |
| US5852228A | Apparatus and method for controlling oxygen sensor heating | Mechanical Engineering; Lighting; Heating | 33 | Expired |
| US7200988B2 | Air-fuel ratio control system and method | Emerging Cross-Sectional Technologies | 30 | Expired |
| US6258232A | Gas component concentration measuring apparatus | Mechanical Engineering; Lighting; Heating | 30 | Expired |
| US8001799B2 | Multiple cooling sources for a vehicle air conditioning system | Performing Operations; Transporting | 28 | Active |
| US6164125A | Detection of malfunction in gas concentration detection system | Mechanical Engineering; Lighting; Heating | 26 | Expired |
| US6539707B2 | Exhaust emission control system for internal combustion engine | Mechanical Engineering; Lighting; Heating | 26 | Expired |
| US5964208A | Abnormality diagnosing system for air/fuel ratio feedback control system | Emerging Cross-Sectional Technologies | 24 | Expired |
| US6976382B2 | Abnormality diagnosing apparatus of exhaust gas sensor | Emerging Cross-Sectional Technologies | 24 | Expired |
| US6032659A | Abnormality diagnosing system for air/fuel ratio feedback control system | Emerging Cross-Sectional Technologies | 24 | Expired |
| US6311482A | Air-fuel ratio control apparatus for internal combustion engines | Emerging Cross-Sectional Technologies | 23 | Expired |
| US6223730A | Fuel injection control system of internal combustion engine | Mechanical Engineering; Lighting; Heating | 22 | Expired |
| US5845486A | Internal combustion engine exhaust gas purifier apparatus | Emerging Cross-Sectional Technologies | 21 | Expired |
| US5974857A | Apparatus and method for controlling oxygen sensor heating | Mechanical Engineering; Lighting; Heating | 20 | Expired |
| US6314790A | Oxygen concentration detecting apparatus | Mechanical Engineering; Lighting; Heating | 20 | Expired |
| US6341599B1 | Power supply control system for heater used in gas concentration sensor | Mechanical Engineering; Lighting; Heating | 20 | Expired |
| US6560959B2 | Exhaust gas purification apparatus of internal combustion engine | Emerging Cross-Sectional Technologies | 19 | Expired |
| US5727383A | Catalyst deterioration detecting apparatus and exhaust emission control device failure detecting apparatus | Emerging Cross-Sectional Technologies | 18 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.