Average Co-Inventor Count = 9.34
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 42,508 patents)
2. Central Japan Railway Company (1 from 118 patents)
3. Koito Electric Industries, Ltd. (1 from 23 patents)
4. A & F Corporation (1 from 2 patents)
2 patents:
1. 11665805 - Lighting device
2. D867208 - Rail vehicle