Average Co-Inventor Count = 1.71
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 Maxell, Limited (2 from 1,112 patents)
2. Hitachi, Ltd. (1 from 42,485 patents)
2 patents:
1. 6054199 - Optical recording medium
2. 5180595 - Metal mold for resin substrate for an optical recording medium