Average Co-Inventor Count = 2.29
ph-index = 3
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. Ringfeder Gmbh (2 from 12 patents)
2. Waggonfabrik Uerdingen A.g. (2 from 7 patents)
4 patents:
1. 4428565 - Arrangement for resilient absorption of forces
2. 4260142 - Arrangement for resilient absorption of forces
3. 4164990 - Passenger evacuation apparatus
4. 3946974 - Railway switch construction for suspended railroad using two-runway-rail