Average Co-Inventor Count = 2.40
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. Idemitsu Kosan Company, Limited (2 from 2,271 patents)
2 patents:
1. 5902777 - Hydraulic working oil composition
2. 4609480 - Lubricant composition for improving fatigue life