Average Co-Inventor Count = 12.00
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. (3 from 42,488 patents)
3 patents:
1. 5966164 - Television telephone
2. 5677727 - Television telephone
3. 5396269 - Television telephone