Average Co-Inventor Count = 3.00
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. Sumitomo Electric Industries, Limited (1 from 10,248 patents)
2. Kazuto Nakazawa, General Director Public Works Research Institute (1 from 1 patent)
1 patent:
1. 4279540 - Collapsable dam