TOHOKU ELECTRIC POWER COMPANY, INC.
71Patents
18Active
71Granted
43Portfolio score
Filing activity: Apr 17, 1975 → Sep 2, 2015 · 5 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5518627A | Method for treating water or an aqueous solution | Emerging Cross-Sectional Technologies | 50 | Expired |
| US5611670A | Blade for gas turbine | Emerging Cross-Sectional Technologies | 47 | Expired |
| US6015953A | Tension clamp for stranded conductor | Electricity | 41 | Expired |
| US5070537A | System for detecting defective point on power transmission line by utilizing satellite | Physics | 36 | Expired |
| US6523352B1 | Piping support of gas turbine steam cooled combustor | Mechanical Engineering; Lighting; Heating | 32 | Expired |
| US4331034A | Ultrasonic probing apparatus | Physics | 27 | Expired |
| US5489194A | Gas turbine, gas turbine blade used therefor and manufacturing method for gas turbine blade | Emerging Cross-Sectional Technologies | 26 | Expired |
| US9255490B2 | Gas turbine and operating method thereof | Mechanical Engineering; Lighting; Heating | 26 | Active |
| US9512781B2 | Cooling structure for recovery-type air-cooled gas turbine combustor | Mechanical Engineering; Lighting; Heating | 25 | Active |
| US5493698A | Radio apparatus for simulataneously transmitting and receiving signals using a simple frequency | Electricity | 24 | Expired |
| US4662712A | Non-metallic self-supporting aerial optical cable | Physics | 23 | Expired |
| US5350523A | Anion exchange method | Performing Operations; Transporting | 23 | Expired |
| US5279760A | Cleaning agent compositions used for gas turbine air compressors | Chemistry; Metallurgy | 20 | Expired |
| US5508619A | System for discriminating kinds of surges on power transmission lines | Physics | 19 | Expired |
| US6173561A | Steam cooling method for gas turbine combustor and apparatus therefor | Mechanical Engineering; Lighting; Heating | 18 | Expired |
| US5553079A | Radio communication apparatus and method for multiplex transmission of voice and data signals | Electricity | 15 | Expired |
| US5843386A | Hydrothermal reaction apparatus | Performing Operations; Transporting | 15 | Expired |
| US5021936A | PWM power converter using mixed bipolar and static induction transistors | Electricity | 14 | Expired |
| US5633862A | DTMF signal transmission method in single frequency simultaneous transmitting and receiving system and single frequency simultaneous transmitting and receiving system transceiver capable of transmitting DTMF signal | Electricity | 14 | Expired |
| US6107532A | Process and system for converting plastics waste into oil | Emerging Cross-Sectional Technologies | 12 | Expired |
| US6164075A | Steam cooling type gas turbine combustor | Mechanical Engineering; Lighting; Heating | 12 | Expired |
| US4719551A | Optically controlled power converting apparatus | Electricity | 11 | Expired |
| US5524274A | Transceiver controlled by absence/presence of input signal | Electricity | 9 | Expired |
| US5956650A | Communication system interconnecting telephone line and single-frequency simultaneous transmission/reception radio system | Electricity | 9 | Expired |
| US5620308A | Gas turbine, gas turbine blade used therefor and manufacturing method for gas turbine blade | Emerging Cross-Sectional Technologies | 9 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.