Average Co-Inventor Count = 5.00
ph-index = 1
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. (1 from 42,517 patents)
2. Hitachi Microsoftware Systems, Inc. (1 from 10 patents)
3. Hitachi Information Systems, Ltd. (1 from 4 patents)
1 patent:
1. 5629714 - Information processing system