Average Co-Inventor Count = 4.80
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. 5265569 - Prime mover rotational speed control system
2. 5036817 - Engine remote control system