Average Co-Inventor Count = 5.00
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. China National Offshore Oil Corporation (1 from 29 patents)
2. China Oilfield Services, Limited (1 from 23 patents)
1 patent:
1. 9982816 - Pup joint for releasing sidewall contact of stratigraphic test device and apparatus