Average Co-Inventor Count = 1.33
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. British Railways Board (2 from 24 patents)
2 patents:
1. 5242136 - Railway signalling systems
2. 5055835 - Track to train communication systems