Average Co-Inventor Count = 11.12
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. (4 from 1,498 patents)
2. Hitachi, Ltd. (2 from 42,485 patents)
4 patents:
1. 6183159 - Automotive soil treating machine
2. 5144843 - Pressure sensor
3. 5050137 - Ultrasonic probe
4. 5003516 - Ultrasonic probe and manufacture method for same