Average Co-Inventor Count = 5.46
ph-index = 1
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. Hitachi Industrial Equipment Systems Co., Ltd. (1 from 494 patents)
2. Central Japan Railway Company (1 from 118 patents)
2 patents:
1. 11104165 - Support service system for inkjet printing apparatus and control method therefor
2. 6931995 - Train maintenance automating system