Takeshi Okumura
83Patents
16h-index
103Co-inventors
87Inventor score
Filing activity: Aug 22, 1977 → Oct 26, 2021
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6711893B2 | Fuel supply apparatus for an internal combustion engine | Emerging Cross-Sectional Technologies | 128 | Expired |
| US6725827B2 | Spark ingition stratified combustion internal combustion engine | Emerging Cross-Sectional Technologies | 53 | Expired |
| US4669434A | Internal combustion engine cylinder head variable swirl siamese type intake port structure, with auxiliary straight passage, pointing at spark plug, leading from mixture intake to downstream end of straight intake port | Emerging Cross-Sectional Technologies | 33 | Expired |
| US4162661A | Internal combustion engine with combustion chambers which create a squish and swirl of an air-fuel mixture | Emerging Cross-Sectional Technologies | 31 | Expired |
| US7091816B1 | Common-mode choke coil | Electricity | 28 | Expired |
| US4312309A | Helically-shaped intake port of an internal combustion engine | Emerging Cross-Sectional Technologies | 27 | Expired |
| US4271803A | Internal combustion engine | Emerging Cross-Sectional Technologies | 22 | Expired |
| US4212270A | Cooling system for an internal combustion engine | Mechanical Engineering; Lighting; Heating | 22 | Expired |
| US4300499A | Combustion chamber of an internal combustion engine | Emerging Cross-Sectional Technologies | 22 | Expired |
| US4411226A | Intake system for an internal combustion engine | Emerging Cross-Sectional Technologies | 21 | Expired |
| US4182279A | Combustion chamber of an internal combustion engine | Emerging Cross-Sectional Technologies | 20 | Expired |
| US6341591B1 | Direct fuel injection-type spark ignition internal combustion engine | Emerging Cross-Sectional Technologies | 19 | Expired |
| US5396821A | Apparatus and method of machining article of eccentric configuration | Emerging Cross-Sectional Technologies | 19 | Expired |
| US4438741A | Device for controlling a flow in a helical type intake port | Emerging Cross-Sectional Technologies | 18 | Expired |
| US7089907B2 | Hydrogen-used internal combustion engine | Emerging Cross-Sectional Technologies | 18 | Expired |
| US4505123A | Absorption heat pump system | Emerging Cross-Sectional Technologies | 17 | Expired |
| US4730579A | Internal combustion engine cylinder head with port coolant passage independent of and substantially wider than combustion chamber coolant passage | Mechanical Engineering; Lighting; Heating | 15 | Expired |
| US4550699A | Intake device of an internal combustion engine | Emerging Cross-Sectional Technologies | 15 | Expired |
| US4699104A | Internal combustion engine cylinder head variable swirl siamese type intake port structure with bypass passage from straight intake passage communicated by gap to helical intake passage | Mechanical Engineering; Lighting; Heating | 15 | Expired |
| US7692527B2 | Common mode choke coil | Electricity | 12 | Active |
| US5819700A | Combustion chamber structure for an internal combustion engine | Emerging Cross-Sectional Technologies | 11 | Expired |
| US4259933A | Combustion chamber of an internal combustion engine | Emerging Cross-Sectional Technologies | 11 | Expired |
| US5224352A | Control device for an absorption refrigeration machine | Emerging Cross-Sectional Technologies | 11 | Expired |
| US5704333A | Fuel injection system for a lean burn engine | Emerging Cross-Sectional Technologies | 11 | Expired |
| US4480625A | Internal combustion engine with helical intake port and combustion chamber with two squish areas | Emerging Cross-Sectional Technologies | 11 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.