Average Co-Inventor Count = 4.00
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 42,485 patents)
3 patents:
1. 6594652 - Electronic discussion system for exchanging information among users creating opinion indexes in accordance with content of each options
2. 6101532 - Electronic conference system
3. 6094675 - Electronic discussion system for exchanging information among users