Average Co-Inventor Count = 4.00
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. Shikoku Research Institute Incorporated (1 from 21 patents)
2. Shikoku Electric Power Co., Inc. (1 from 17 patents)
3. Nippon Gear Co., Ltd. (1 from 10 patents)
1 patent:
1. 5224512 - Valve stem driving apparatus