Average Co-Inventor Count = 2.00
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, Ltd. (1 from 42,488 patents)
2. Hitachi Powdered Metals (1 from 1 patent)
1 patent:
1. 4829950 - Valve lifter and method of producing the same