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. National Oilwell Varco Norway As (3 from 50 patents)
2. National Oilwell Vargo Norway As (1 from 1 patent)
4 patents:
1. 11885204 - Drilling rig
2. 10961825 - Drilling rig
3. 10557314 - Rig floor for a drilling rig
4. 9303468 - Drilling system and a device for assembling and disassembling pipe stands