Average Co-Inventor Count = 6.00
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. Nippon Oil Company (1 from 690 patents)
2. Nippon Petroleum Refining Company, Limited (1 from 20 patents)
1 patent:
1. 5543041 - Supply system of petroleum heavy oil containing magnetic fine particles