18 Utility Patents
#3 in Langfang
#6,436 in China
#194,905 in the World
Forward Citations = 9
Company Filing History:
China Oilfield Services, Limited

where one patent can have more than one assignee
Get your Inventor Badge Today
#3 in Langfang
#6,436 in China
#194,905 in the World
Company Filing History:

Get your Inventor Badge Today