Average Co-Inventor Count = 6.00
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 1,498 patents)
2. Other (1 from 832,680 patents)
2 patents:
1. 5335547 - Ultrasonic flaw detector
2. 4971061 - Apparatus for recording intracranial pressure