Average Co-Inventor Count = 19.01
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 National Petroleum Corporation (1 from 81 patents)
2. China University of Petroleum (1 from 25 patents)
3. Cnpc Bohai Driling Engineering Company Limited (1 from 1 patent)
4. Tianjin Era Biology Technology Co., Ltd. (0 patent)
5. Beihai Sinlon Biotech Co., Ltd. (0 patent)
6. Beijing Gold Mountainriver Tech Development Co., Ltd. (0 patent)
7. Era Biology (suzhou) Co., Ltd. (0 patent)
1 patent:
1. 12000222 - Pressure compensation device with accumulator group for controlled pressure drilling