Average Co-Inventor Count = 3.00
ph-index = 1
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. Petroleum Energy Center (1 from 58 patents)
2. Showa Shell Sekiyu K.k. (1 from 46 patents)
1 patent:
1. 5677259 - Gas oil desulfurization catalyst and desulfurization method