Hitachi Engineering & Services Co., Ltd.
39Patents
18Active
39Granted
45Portfolio score
Filing activity: Apr 10, 1986 → Dec 6, 2011 · 16 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6853959B2 | Remote monitoring diagnostic system and method thereof | Emerging Cross-Sectional Technologies | 63 | Expired |
| US5325012A | Bonded type piezoelectric apparatus, method for manufacturing the same and bonded type piezoelectric element | Electricity | 58 | Expired |
| US5929458A | Radiation shield | Physics | 57 | Expired |
| US7260173B2 | Apparatus and method for detecting threats | Physics | 53 | Expired |
| US5992154A | Drier for drying internal cooling gas of electric machine | Physics | 37 | Expired |
| US6407900B1 | Lightning protection system for wind power generation installation | Emerging Cross-Sectional Technologies | 21 | Expired |
| US6816048B2 | Electromagnet and actuating mechanism for switch device, using thereof | Electricity | 21 | Expired |
| US5162633A | Microwave-excited plasma processing apparatus | Electricity | 18 | Expired |
| US6304468A | Phase synchronization system for connecting a power converter to a power distribution system | Electricity | 13 | Expired |
| US5218505A | Superconductor coil system and method of operating the same | Emerging Cross-Sectional Technologies | 11 | Expired |
| US6004377A | System for collecting and refining SF.sub.6 gas and method therefor | Emerging Cross-Sectional Technologies | 11 | Expired |
| US7961067B2 | Superconducting magnet apparatus and magnetic resonance imaging apparatus | Physics | 10 | Active |
| US8248204B2 | Tag detecting system, moving object detecting method, and entrance/exit management system | Physics | 10 | Active |
| US6999903B2 | Remote monitoring diagnostic system and method thereof | Emerging Cross-Sectional Technologies | 9 | Expired |
| US7177821B2 | Maintenance information management system and method of providing a maintenance plan | Emerging Cross-Sectional Technologies | 9 | Expired |
| US7075398B2 | Electromagnet and actuating mechanism for switch device, using thereof | Electricity | 7 | Expired |
| US8334606B2 | Wind power generation system of a type provided with power storage system | Emerging Cross-Sectional Technologies | 7 | Active |
| US5347100A | Semiconductor device, process for the production thereof and apparatus for microwave plasma treatment | Electricity | 7 | Expired |
| US7841237B2 | Ultrasonic testing apparatus for turbine forks and method thereof | Physics | 6 | Active |
| US5140165A | Vessel for solidification treatment of radioactive waste pellets | Emerging Cross-Sectional Technologies | 5 | Expired |
| US4690251A | Emergency control system for elevators | Physics | 5 | Expired |
| US5732362A | Method for treating radioactive laundry waste water | Physics | 5 | Expired |
| US8575886B2 | Power storage apparatus of power generation system and operating method of power storage apparatus | Emerging Cross-Sectional Technologies | 5 | Active |
| US5859438A | Radiation shielding body | Physics | 4 | Expired |
| US7872472B2 | Eddy current testing apparatus and eddy current testing method | Physics | 3 | Active |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.