Average Co-Inventor Count = 4.31
ph-index = 12
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. (26 from 42,508 patents)
2. Other (9 from 832,880 patents)
3. Hitachi Video and Information System, Inc. (3 from 46 patents)
4. Hitachi Maxell, Limited (1 from 1,112 patents)
5. Hitachi Video and Information Systems, Inc. (1 from 13 patents)
35 patents:
1. 8094890 - Biometric authentication apparatus, biometric authentication system, IC card and biometric authentication method
2. 8001326 - Portable terminal
3. 7737824 - Radio frequency identification (RFID) tag, portable terminal, and server for RFID tag
4. 7710272 - Radio frequency identification (RFID) device with a response stop command
5. 7628323 - System of settlement transaction and method
6. 7611047 - System of settlement transaction and method
7. 7425897 - Radio frequency identification (RFID) device with a response stop command
8. 7404523 - IC card with a cipher key conversion function
9. 7360091 - Secure data transfer method of using a smart card
10. 7356645 - Portable terminal with an IC card mounted thereon
11. 7346579 - Electronic purse application system and method thereof
12. 7278029 - Program writable IC card and method thereof
13. 7246739 - System of settlement transaction and method
14. 6976625 - Electronic purse
15. 6938165 - Program writable IC card and method thereof