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. Bethlehem Steel Corporation (1 from 370 patents)
2. Portland General Electric Company (1 from 5 patents)
2 patents:
1. 4589348 - Retrofitted railway car and method of producing same
2. 4361097 - Railway gondola cars