Average Co-Inventor Count = 4.20
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. Hitachi Construction Machinery Co., Ltd. (2 from 1,504 patents)
2 patents:
1. 6101456 - Output correcting method in control system, control system, and
2. 5497805 - Drive control system for hydraulic machine