2 Utility Patents
#15,171 in Beijing
#64,871 in China
Forward Citations = 0
Company Filing History:

Cnpc Engineering Technology R&d Company Limited
Beijing Petroleum Machinery Co.
4. 1 out of 1
Cnpc Drilling Research Institute
5. 1 out of 1
Beijing Petroleum Machinery Factory
where one patent can have more than one assignee
Get your Inventor Badge Today