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. Teijin Limited (1 from 1,586 patents)
2. Penta-ocean Construction Co., Ltd. (1 from 3 patents)
1 patent:
1. 4451175 - Method for improving soft ground by sand drain method and cylindrical