Chicago, Illinois
United States
3
2014-09-18
The entities that hold a legal rights for patent applications filed by inventor Zhou Changjun:
Changjun Zhou from Chicago, US has applied for patents for these inventions. The list has both pending applications and granted patents:
Drilling fluid additive for loss circulation and wellbore strengthening
#2 | 2014-08-07Wellbore fluid testing assembly
#3 | 2013-12-31Cement compositions including resilient graphitic carbon fraction
858106 ⎘