5 Utility Patents
#261 in Qingdao
#26,943 in China
#825,595 in the World
Forward Citations = 3
Company Filing History:
China University of Petroleum
China University of Geosciences (beijing)
Northwest Oilfield Branch, China Petroleum & Chemical Co., Ltd
4. 1 out of 1
Shengli Oilfield Branch, China Petroleum & Chemical Co., Ltd
5. 1 out of 3
Oil and Gas Technology Research Institute, Petrochina Changqing Oilfield Company
where one patent can have more than one assignee
Get your Inventor Badge Today