KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO
1,162Patents
381Active
1,162Granted
54Portfolio score
Filing activity: Jun 11, 1973 → Feb 3, 2023 · 87 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4106446A | Internal combustion engine with auxiliary combustion chamber | Emerging Cross-Sectional Technologies | 1,388 | Expired |
| US5726435A | Optically readable two-dimensional code and method and apparatus using the same | Physics | 396 | Expired |
| US6259423A | Display device using organic electroluminescent elements | Electricity | 259 | Expired |
| US5272871A | Method and apparatus for reducing nitrogen oxides from internal combustion engine | Emerging Cross-Sectional Technologies | 207 | Expired |
| US4889885A | Composite material containing a layered silicate | Chemistry; Metallurgy | 207 | Expired |
| US5369289A | Gallium nitride-based compound semiconductor light-emitting device and method for making the same | Electricity | 198 | Expired |
| US4810734A | Process for producing composite material | Chemistry; Metallurgy | 196 | Expired |
| US4274423A | Catheter tip pressure transducer | Human Necessities | 192 | Expired |
| US4739007A | Composite material and process for manufacturing same | Chemistry; Metallurgy | 184 | Expired |
| US5062673A | Articulated hand | Emerging Cross-Sectional Technologies | 158 | Expired |
| US5408120A | Light-emitting device of gallium nitride compound semiconductor | Electricity | 154 | Expired |
| US5412946A | NOx decreasing apparatus for an internal combustion engine | Emerging Cross-Sectional Technologies | 152 | Expired |
| US6607693B1 | Titanium alloy and method for producing the same | Emerging Cross-Sectional Technologies | 144 | Expired |
| US4894411A | Composite material and process for producing the same | Chemistry; Metallurgy | 143 | Expired |
| US4173725A | Piezoelectrically driven ultrasonic transducer | Performing Operations; Transporting | 140 | Expired |
| US4993386A | Operation control system for internal combustion engine | Emerging Cross-Sectional Technologies | 138 | Expired |
| US6020600A | Silicon carbide semiconductor device with trench | Emerging Cross-Sectional Technologies | 134 | Expired |
| US4471786A | Telemetering intracranial pressure transducer | Emerging Cross-Sectional Technologies | 132 | Expired |
| US5838154A | Multilayered magnetic sensor having conductive layer within megnetic layer | Physics | 129 | Expired |
| US4949262A | Electronic controlled fluid suspension system with an advance control and a feedback control of a vehicle attitude | Performing Operations; Transporting | 120 | Expired |
| US4949268A | Land vehicle navigation system | Physics | 119 | Expired |
| US6093338A | Crystal-oriented ceramics, piezoelectric ceramics using the same, and methods for producing the same | Electricity | 104 | Expired |
| US4469593A | Blood purification apparatus | Human Necessities | 104 | Expired |
| US4472538A | Composite material composed of clay mineral and organic high polymer and method for producing the same | Emerging Cross-Sectional Technologies | 103 | Expired |
| US5164460A | Polyimide composite material and process for producing the same | Electricity | 102 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.