IDEMITSU KOSAN CO., LTD.
2,316Patents
1,352Active
2,316Granted
58Portfolio score
Filing activity: Jan 14, 1974 → Nov 14, 2024 · 437 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5962962A | Method of encapsulating organic electroluminescence device and organic electroluminescence device | Electricity | 302 | Expired |
| US8384077B2 | Field effect transistor using oxide semicondutor and method for manufacturing the same | Electricity | 245 | Active |
| US7998372B2 | Semiconductor thin film, method for manufacturing the same, thin film transistor, and active-matrix-driven display panel | Emerging Cross-Sectional Technologies | 214 | Active |
| US5909081A | Multi-color light emission apparatus with organic electroluminescent device | Emerging Cross-Sectional Technologies | 206 | Expired |
| US6107734A | Organic EL light emitting element with light emitting layers and intermediate conductive layer | Electricity | 172 | Expired |
| US6538374B2 | Actively driven organic EL device and manufacturing method thereof | Electricity | 161 | Expired |
| US5126214A | Electroluminescent element | Emerging Cross-Sectional Technologies | 146 | Expired |
| US6486601B1 | Organic luminescence device with reduced leakage current | Electricity | 134 | Expired |
| US10435350B2 | Organic electroluminecence device | Electricity | 124 | Active |
| US4680353A | Process for production of styrene polymers | Chemistry; Metallurgy | 121 | Expired |
| US8232552B2 | Noncrystalline oxide semiconductor thin film, process for producing the noncrystalline oxide semiconductor thin film, process for producing thin-film transistor, field-effect-transistor, light emitting device, display device, and sputtering target | Electricity | 118 | Active |
| US5869929A | Multicolor luminescent device | Electricity | 115 | Expired |
| US6284393A | Organic electroluminescent device | Emerging Cross-Sectional Technologies | 112 | Expired |
| US8158974B2 | Semiconductor device, polycrystalline semiconductor thin film, process for producing polycrystalline semiconductor thin film, field effect transistor, and process for producing field effect transistor | Electricity | 105 | Active |
| US5369196A | Production process of olefin based polymers | Emerging Cross-Sectional Technologies | 102 | Expired |
| US3983008A | Method of extracting useful components from microbial cells | Emerging Cross-Sectional Technologies | 101 | Expired |
| US4645513A | Process for modification of coal | Chemistry; Metallurgy | 98 | Expired |
| US5121029A | Electroluminescence device having an organic electroluminescent element | Emerging Cross-Sectional Technologies | 97 | Expired |
| US5130603A | Organic electroluminescence device | Emerging Cross-Sectional Technologies | 97 | Expired |
| US4508539A | Process for improving low quality coal | Chemistry; Metallurgy | 95 | Expired |
| US4564647A | Process for the production of polyethylene compositions | Emerging Cross-Sectional Technologies | 94 | Expired |
| US4814540A | Process for producing propylene oligomers | Emerging Cross-Sectional Technologies | 91 | Expired |
| US6416888B1 | Organic electroluminescent device and method of manufacture thereof | Emerging Cross-Sectional Technologies | 88 | Expired |
| US8981369B2 | Field effect transistor using oxide semiconductor and method for manufacturing the same | Electricity | 87 | Active |
| US5070468A | Plant fault diagnosis system | Emerging Cross-Sectional Technologies | 86 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.