Average Co-Inventor Count = 3.16
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 42,485 patents)
3 patents:
1. 7197149 - Cellular phone
2. 6928306 - Portable mobile unit
3. 5748715 - Method of communications between telephone and facsimile apparatus and