Average Co-Inventor Count = 2.67
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. Federal Signal Corporation (2 from 161 patents)
2 patents:
1. 5884997 - Light bar
2. D364109 - Sign for signalling direction of traffic flow