Average Co-Inventor Count = 4.44
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 42,517 patents)
2. Hitachi Chemical Company, Ltd. (1 from 1,641 patents)
2 patents:
1. 4460535 - Method for producing flyback transformers
2. 4305056 - Transformer with gapped core