Average Co-Inventor Count = 4.00
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 42,494 patents)
2. Pioneer Electronic Corporation (1 from 2,861 patents)
1 patent:
1. 4525636 - Variable electronic impedance circuit