Average Co-Inventor Count = 5.00
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 1,500 patents)
2 patents:
1. 6135149 - Pressure compensating valves
2. 5957159 - Directional control valve with flow distribution valves