Average Co-Inventor Count = 4.00
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. Bj-hughes Inc. (1 from 34 patents)
1 patent:
1. 4187546 - Computer-controlled oil drilling rig having drawworks motor and brake