Average Co-Inventor Count = 1.67
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. Baker Hughes Corporation (1 from 5,728 patents)
2. Norton Christensen, Inc. (1 from 37 patents)
2 patents:
1. 5156222 - Directional drilling tool apparatus and method
2. 4519574 - Auxiliary controlled valve disposed in a drilling string