Average Co-Inventor Count = 2.40
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. Sumitomo Heavy Industries, Ltd. (2 from 1,177 patents)
2 patents:
1. 5292289 - Internally meshing planetary gear assembly
2. 4898065 - Planetary reduction gear