Average Co-Inventor Count = 9.81
ph-index = 2
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. (3 from 42,496 patents)
3 patents:
1. 8073312 - Recorder equipped with dubbing function
2. 6895393 - Electronic book distributing system by use of purchase certificate and devices therefor
3. 5808704 - Rear projection type image display apparatus