TOKYO ELECTRIC POWER COMPANY HOLDINGS, INCORPORATED
233Patents
52Active
233Granted
46Portfolio score
Filing activity: Apr 9, 1974 → Jan 27, 2021 · 23 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5607899A | Method of forming single-crystalline thin film | Emerging Cross-Sectional Technologies | 281 | Expired |
| US5448696A | Map information system capable of displaying layout information | Physics | 100 | Expired |
| US5210868A | Database system and matching method between databases | Emerging Cross-Sectional Technologies | 84 | Expired |
| US4955082A | Mobile communication system | Electricity | 84 | Expired |
| US5000004A | Gas turbine combustor | Mechanical Engineering; Lighting; Heating | 67 | Expired |
| US5226928A | Reforming apparatus for hydrocarbon | Chemistry; Metallurgy | 66 | Expired |
| US5447024A | Chemical-looping combustion power generation plant system | Emerging Cross-Sectional Technologies | 52 | Expired |
| US4107778A | Digital fault-location calculation system | Physics | 49 | Expired |
| US4947452A | Mobile communication system | Electricity | 46 | Expired |
| US5932523A | Superconducting cable conductor | Electricity | 44 | Expired |
| US5372089A | Method of forming single-crystalline thin film | Emerging Cross-Sectional Technologies | 44 | Expired |
| US6625520B1 | System and method for operating electric power systems utilizing optimal power flow | Emerging Cross-Sectional Technologies | 43 | Expired |
| US4545767A | Training operation system and simulator for training in electric power system | Physics | 39 | Expired |
| US4857499A | High temperature combustion catalyst and method for producing the same | Mechanical Engineering; Lighting; Heating | 39 | Expired |
| US6500236B2 | Method for decarbonating waste gas and decarbonating apparatus | Emerging Cross-Sectional Technologies | 39 | Expired |
| US6467289B2 | Hot-water supply system with heat pump cycle | Emerging Cross-Sectional Technologies | 36 | Expired |
| US5379357A | Method and apparatus for polarized optical telecommunications using ultrasonic modulation means | Electricity | 32 | Expired |
| US7093619B2 | Vacuum-insulated pipe | Mechanical Engineering; Lighting; Heating | 30 | Expired |
| US3984737A | Protective relaying system | Electricity | 30 | Expired |
| US5617280A | Superconducting fault current limiter | Emerging Cross-Sectional Technologies | 30 | Expired |
| US6467288B2 | Heat-pump water heater | Emerging Cross-Sectional Technologies | 29 | Expired |
| US5209645A | Ceramics-coated heat resisting alloy member | Emerging Cross-Sectional Technologies | 28 | Expired |
| US6747370B2 | High-temperature secondary battery based energy storage and power compensation system | Emerging Cross-Sectional Technologies | 28 | Expired |
| US5113277A | Fiber optic distributed temperature sensor system | Physics | 28 | Expired |
| US6271474A | Methods of manufacturing oxide superconducting stranded wire and oxide superconducting cable conductor, and coated wire, stranded wire and cable conductor | Emerging Cross-Sectional Technologies | 27 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.