Average Co-Inventor Count = 1.00
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. The Robbins Company (1 from 41 patents)
2. Compagnie Du Sol (1 from 30 patents)
1 patent:
1. 6955232 - Equipment for drilling vertical boreholes