Average Co-Inventor Count = 10.00
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 42,535 patents)
2. Hitachi Denshi Kabushiki Kaisha (1 from 208 patents)
3. Japanese National Railways (1 from 50 patents)
1 patent:
1. 4112260 - AC type line concentrator