Average Co-Inventor Count = 2.19
ph-index = 3
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. (3 from 1,508 patents)
2. Other (2 from 833,002 patents)
3 patents:
1. 6019569 - Excavation machine
2. 4984567 - Apparatus for measuring intracranial pressure
3. 4971061 - Apparatus for recording intracranial pressure