Average Co-Inventor Count = 1.20
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. 4232793 - Car coupling arrangement for railway passenger cars
2. 4224878 - Hopper car door locking mechanism
3. 4141093 - Sleeping berth for passenger car compartment