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. Nhk Spring Co., Ltd. (1 from 1,232 patents)
1 patent:
1. 9480891 - Metal shaft having longitudinally varying hardness, golf shaft using the metal shaft, golf club using the metal golf shaft, method of manufacturing the metal shaft, and tempering apparatus