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 42,485 patents)
2. Hitachi Maxell, Limited (1 from 1,112 patents)
2 patents:
1. 5914068 - Bi-layer oxide ferroelectrics
2. 4840844 - Magnetic recording medium