Average Co-Inventor Count = 2.40
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. Pullman Incorporated (2 from 228 patents)
2 patents:
1. 4250814 - Dual hopper car doors
2. 4130068 - Center filler for railway cars