Average Co-Inventor Count = 2.50
ph-index = 1
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 Automotive Systems, Ltd. (3 from 2,028 patents)
3 patents:
1. 9683465 - Valve-timing control apparatus for internal combustion engine
2. 8701619 - Internal combustion engine piston
3. 8220432 - Internal combustion engine piston