Average Co-Inventor Count = 3.00
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. Nippon Oil Company (1 from 690 patents)
2. Nippon Mitsubishi Oil Corporation (1 from 84 patents)
2 patents:
1. 6692654 - Refrigerating machine oil
2. 5549838 - Hydraulic working oil composition for buffers