Average Co-Inventor Count = 7.39
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. Nippon Steel Corporation (4 from 3,554 patents)
2. Kabushiki Kaisha Toyoda Jidoshokki Seisakusho (4 from 1,343 patents)
4 patents:
1. 5092281 - Hydrogen engine system
2. 5088452 - Method for starting a hydrogen engine and a method for stopping a
3. 5082048 - Hydrogen engine system with metal hydride container
4. 5067447 - Method for controlling heat of a metal hydride container