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. Imperial Oil Limited (2 from 29 patents)
2 patents:
1. 4533778 - Traction fluid lubricants derived from mineral oil
2. 4387256 - Traction fluid lubricants derived from coal tar