Toyoaki Nakagawa
25Patents
12h-index
23Co-inventors
77Inventor score
Filing activity: Sep 26, 1980 → Aug 4, 1999
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5009210A | Air/fuel ratio feedback control system for lean combustion engine | Mechanical Engineering; Lighting; Heating | 67 | Expired |
| US6078163A | Battery temperature increasing device and method | Emerging Cross-Sectional Technologies | 56 | Expired |
| US6127806A | State of charge indicator | Physics | 34 | Expired |
| US5060473A | System for detecting deterioration of catalyst in catalytic converter | Emerging Cross-Sectional Technologies | 22 | Expired |
| US4707241A | Air/fuel ratio control system including means to well time start of feedback | Mechanical Engineering; Lighting; Heating | 21 | Expired |
| US4712529A | Air-fuel ratio control for transient modes of internal combustion engine operation | Mechanical Engineering; Lighting; Heating | 17 | Expired |
| US6160375A | Charge controlling device and method for multi-cell battery, and electric vehicle provided with change controlling | Emerging Cross-Sectional Technologies | 17 | Expired |
| US4592325A | Air/fuel ratio control system | Mechanical Engineering; Lighting; Heating | 16 | Expired |
| US4503820A | Fuel injection quantity sensing apparatus for an internal combustion engine | Emerging Cross-Sectional Technologies | 16 | Expired |
| US4825837A | Air/fuel ratio control system having gain adjusting means | Mechanical Engineering; Lighting; Heating | 16 | Expired |
| US4609292A | Device and method for measuring a temperature difference | Emerging Cross-Sectional Technologies | 15 | Expired |
| US4452217A | Exhaust gas recirculation control system for a diesel engine and control method therefor | Emerging Cross-Sectional Technologies | 14 | Expired |
| US6284404A | Battery and gas effluent system therefor | Emerging Cross-Sectional Technologies | 10 | Expired |
| US4458529A | Hot wire flow meter | Physics | 10 | Expired |
| US4363306A | System for feedback control of air/fuel ratio in IC engine having means for supplying controlled current to oxygen sensor | Mechanical Engineering; Lighting; Heating | 9 | Expired |
| US4471653A | Crank angle detecting device for an internal combustion engine and detecting method therefor | Mechanical Engineering; Lighting; Heating | 9 | Expired |
| US4446840A | Exhaust gas recirculation control system for internal combustion engine | Emerging Cross-Sectional Technologies | 8 | Expired |
| US4669440A | Fuel injection detecting system for a diesel engine | Emerging Cross-Sectional Technologies | 7 | Expired |
| US4949694A | Fuel supply control system for internal combustion engine | Mechanical Engineering; Lighting; Heating | 7 | Expired |
| US6278280A | Battery inactivation detection device | Emerging Cross-Sectional Technologies | 7 | Expired |
| US5065716A | Fuel supply control system for internal combustion engine with improved engine acceleration characterisitcs after fuel cut-off operation | Mechanical Engineering; Lighting; Heating | 7 | Expired |
| US4870937A | Air fuel mixture A/F control system | Mechanical Engineering; Lighting; Heating | 7 | Expired |
| US4501140A | Fuel injection rate deducing system for a diesel engine | Emerging Cross-Sectional Technologies | 5 | Expired |
| US6287727A | Manganese-lithium ion electrolytic cell | Emerging Cross-Sectional Technologies | 4 | Expired |
| US4706633A | Air/fuel ratio feedback control system adapted to temporary open-loop control under transient conditions | Mechanical Engineering; Lighting; Heating | 4 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.