Beijing
China
3
2016-07-14
The entities that hold a legal rights for patent applications filed by inventor SU Changming:
Changming SU from Beijing, CN has applied for patents for these inventions. The list has both pending applications and granted patents:
Cationic copolymer and use thereof in lost circulation additive
#2 | 2012-03-29Copolymer and preparation method and application thereof
#3 | 2008-01-29Electropositive production well treating fluid and method of preparing the same
1590694 ⎘