Hiroshi Kitagawa
115Patents
19h-index
165Co-inventors
89Inventor score
Filing activity: Sep 10, 1975 → Jul 6, 2021
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6008783A | Keyboard instrument with the display device employing fingering guide | Physics | 155 | Expired |
| US5678402A | Air-fuel ratio control system for internal combustion engines and exhaust system temperature-estimating device applicable thereto | Emerging Cross-Sectional Technologies | 101 | Expired |
| US5280770A | Variable valve actuation control system | Emerging Cross-Sectional Technologies | 47 | Expired |
| US5609023A | Fuel supply control system for internal combustion engines | Emerging Cross-Sectional Technologies | 39 | Expired |
| US5236332A | Method of controlling an internal combustion engine | Emerging Cross-Sectional Technologies | 39 | Expired |
| US5907115A | Keyboard musical instrument with keyboard range indicator | Physics | 38 | Expired |
| US6235823A | Crystalline polypropylene resin composition and amide compounds | Chemistry; Metallurgy | 35 | Expired |
| US5092298A | Fail-safe system for throttle valve controller | Mechanical Engineering; Lighting; Heating | 32 | Expired |
| US5797384A | Air-fuel ratio control system based on adaptive control theory for internal combustion engines | Mechanical Engineering; Lighting; Heating | 28 | Expired |
| US6073073A | Air/fuel ratio control system for an internal combustion engine | Mechanical Engineering; Lighting; Heating | 27 | Expired |
| US7021300B2 | Diagnostic apparatus for an exhaust gas sensor | Mechanical Engineering; Lighting; Heating | 26 | Expired |
| US5505174A | EGR rate estimation system for internal combustion engine | Emerging Cross-Sectional Technologies | 23 | Expired |
| US6236430A | Color still image sensing apparatus and method | Electricity | 22 | Expired |
| US5137105A | System and method for controlling torque of driving wheel | Performing Operations; Transporting | 21 | Expired |
| US5613481A | Control system having function of processing evaporative fuel for internal combustion engines | Mechanical Engineering; Lighting; Heating | 21 | Expired |
| US6026793A | Control system for plants | Mechanical Engineering; Lighting; Heating | 20 | Expired |
| US4138916A | Key assignor | Emerging Cross-Sectional Technologies | 19 | Expired |
| US5586544A | Fuel injection amount control system for internal combustion engines and intake passage wall temperature-estimating device used therein | Mechanical Engineering; Lighting; Heating | 19 | Expired |
| US4152480A | Method for making nonwoven fabric and product | Emerging Cross-Sectional Technologies | 19 | Expired |
| US5391627A | Heat-resistant, oil-resistant rubber composition | Mechanical Engineering; Lighting; Heating | 18 | Expired |
| US5299544A | Evaporative fuel-purging control system for internal combustion engines | Mechanical Engineering; Lighting; Heating | 17 | Expired |
| US5441031A | Evaporative fuel processing system for internal combustion engine | Emerging Cross-Sectional Technologies | 16 | Expired |
| US5701871A | Fuel supply control system for internal combustion engines | Mechanical Engineering; Lighting; Heating | 16 | Expired |
| US5661972A | Air-fuel ratio control system for internal combustion engines | Mechanical Engineering; Lighting; Heating | 15 | Expired |
| US4420415A | Process for the production of carbon molecular sieves | Performing Operations; Transporting | 14 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.