5 Utility Patents
#92 in Sichuan
#27,021 in China
#826,260 in the World
Forward Citations = 0
Company Filing History:
Cnpc Chuanqing Drilling Engineering Company Limited

Ccdc Petroleum Drilling & Production Technology Co Ltd
4. 1 out of 1
Yibin Yunchen Abor & Gargen Co., Ltd.
where one patent can have more than one assignee
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