Average Co-Inventor Count = 3.26
ph-index = 10
The patent ph-index is calculated by counting the number of publications for which an author has been cited by other authors at least that same number of times.
Company Filing History:
1. Hitachi, Ltd. (13 from 42,508 patents)
2. Renesas Technology Corp. (1 from 3,781 patents)
3. Hitachi-Kokusai Electric Inc. (1 from 1,258 patents)
15 patents:
1. 12001692 - Access control system and access control method
2. 11366695 - System and method for assisting charging to use of accelerator unit
3. 11151141 - Data processing device and data processing method
4. 10936377 - Distributed database system and resource management method for distributed database system
5. 7755480 - Security system
6. 7710455 - Node management system and node managing program using sensing system
7. 7675410 - Sensor-net systems and its application systems for locationing
8. 7427916 - Method for inspecting and monitoring building, structure, or facilities accompanying them
9. 7187961 - Semiconductor device for sensor system
10. 7016812 - Apparatus and control method for intelligent sensor device
11. 6950767 - Quality monitoring system for building structure, quality monitoring method for building structure and semiconductor integrated circuit device
12. 5715412 - Method of acoustically expressing image information
13. 5185848 - Noise reduction system using neural network
14. 5142582 - Speech coding and decoding system with background sound reproducing
15. 5077798 - Method and system for voice coding based on vector quantization