Average Co-Inventor Count = 1.00
ph-index = 4
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. Other (3 from 832,912 patents)
2. Futrex, Inc. (2 from 30 patents)
5 patents:
1. 5237932 - Collapsible railing
2. 5209435 - Passsenger car with emergency exit
3. 4485967 - Mechanical joint
4. 4476787 - Railway switch
5. 4394837 - Passenger station for elevated railway system