Average Co-Inventor Count = 1.67
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. Federal Signal Corporation (4 from 161 patents)
4 patents:
1. 6100791 - Programmable emergency signalling device and system
2. 5557257 - Programmable emergency signalling system for a vehicle
3. 5422623 - Programmable emergency signalling device and system
4. 5296840 - Programmable emergency signalling system for a vehicle