Average Co-Inventor Count = 2.00
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. Societe Nationale Elf Aquitaine (production) (1 from 215 patents)
2. Geoservices (1 from 15 patents)
1 patent:
1. 4134294 - Device for simultaneously measuring various parameters of the drilling