Average Co-Inventor Count = 13.00
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. China Railway Tunnel Group Co., Ltd. (1 from 5 patents)
2. China Railway Tunnel Stock Co., Ltd. (1 from 2 patents)
1 patent:
1. 11371348 - Pipeline annular self-traveling guide apparatus and method