Average Co-Inventor Count = 1.80
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 (3 from 228 patents)
3 patents:
1. 4318349 - Railway car end doors
2. 4317415 - Railway car end doors
3. 4287833 - Auto carrier railway car