Average Co-Inventor Count = 6.00
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. (2 from 42,488 patents)
2. Showa Denko K.k. (1 from 1,960 patents)
3. Showa Denka K.k. (1 from 11 patents)
2 patents:
1. 4879192 - Secondary cell
2. 4559284 - Secondary battery