Average Co-Inventor Count = 3.43
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. Portec, Inc. (2 from 46 patents)
2 patents:
1. 4454823 - Bulk freight rail car with metallized interior surfaces
2. 4444123 - Curved roof hooper car