Average Co-Inventor Count = 5.89
ph-index = 3
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. (2 from 42,488 patents)
2. Hitachi Information & Control Solutions, Ltd. (1 from 18 patents)
3 patents:
1. D569286 - Biometrics input unit
2. D342067 - Wireless telephone
3. D339802 - Wireless telephone