6 Utility Patents
#206 in Qingdao
#22,425 in China
#696,408 in the World
Forward Citations = 2
Company Filing History:
China University of Petroleum
China University of Geosciences (beijing)
Science and Technology Research Institute Ltd., Petro China
4. 1 out of 3
Oil and Gas Technology Research Institute, Petrochina Changqing Oilfield Company
where one patent can have more than one assignee
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