Average Co-Inventor Count = 2.57
ph-index = 3
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. Westvaco Corporation (2 from 790 patents)
2. Westavco Corporation (1 from 1 patent)
3 patents:
1. 5276000 - Preparation for high activity, high density carbon
2. 5238470 - Emission control device
3. 5204310 - High activity, high density activated carbon