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. Eastman Christensen Company (1 from 38 patents)
2. Sperber, Axel (0 patent)
3. Jung, Reinhard (0 patent)
1 patent:
1. 4955438 - Core drilling tool