Average Co-Inventor Count = 3.84
ph-index = 17
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. (54 from 42,485 patents)
2. Other (9 from 832,680 patents)
3. Hitachi Video and Information System, Inc. (3 from 46 patents)
4. Samsung Electronics Co., Ltd. (1 from 131,214 patents)
5. Kabushikikaisha Kenwood (1 from 301 patents)
6. Hitachi Video Engineering, Incorporated (1 from 66 patents)
7. Hitachi Video and Information Systems, Inc. (1 from 13 patents)
65 patents:
1. 8314858 - Imaging and recording apparatus controlling erasure of data in flash type memory
2. 7379915 - Electronic purse loan system
3. 7346579 - Electronic purse application system and method thereof
4. 7304669 - Imaging and recording apparatus
5. 7278029 - Program writable IC card and method thereof
6. 6976625 - Electronic purse
7. 6938165 - Program writable IC card and method thereof
8. 6902106 - Electronic money transaction system with a radio transmitter and receiver using a portable telephone
9. 6827258 - Electronic purse
10. 6813321 - Digital demodulator
11. 6732272 - Program writable integrated circuit card and method therefore
12. 6679423 - Electronic-money rewarding system for lost and found IC card
13. 6677989 - Imaging and recording apparatus
14. 6634549 - IC card automated transaction terminal and IC used therein
15. 6536661 - Electronic money transaction system with a radio transmitter and receiver using a portable telephone