Average Co-Inventor Count = 4.09
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 42,485 patents)
3 patents:
1. 7328167 - Service reservation system
2. 7016665 - Charging method and terminal equipment in the information and communication network system
3. 6675007 - Charging method and terminal equipment in the information and communication network system