2 Utility and 1 Design Patents
#673 in Shandong
#64,510 in China
rank by utility patentsForward Citations = 1
Company Filing History:
Drilling Technology Research Institute of Sinopec Shengli Petroleum Engineering Co., Ltd.
Sinopec Shengli Petroleum Engineering Co., Ltd
Sinopec Oilfield Service Corporation
4. 1 out of 6
Sinopec Petroleum Engineering Technology Service Co., Ltd.
5. 1 out of 674
China Petroleum Chemical Corporation
where one patent can have more than one assignee
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