Average Co-Inventor Count = 5.00
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 42,508 patents)
2. Hitachi Software Engineering Company, Ltd. (3 from 228 patents)
3. Hitachi Communication Systems, Inc. (2 from 17 patents)
4. Hitachi Communications Systems, Inc. (1 from 3 patents)
3 patents:
1. 5815564 - System for connecting an incoming call to a selected one of a number of
2. 5563940 - System for connecting an incoming call to a selected one of a number of
3. 5541992 - System for connecting an incoming call to a selected one of a number of