Wuhan
China
3
2018-10-25
The entities that hold a legal rights for patent applications filed by inventor DU Cheng:
Cheng DU from Wuhan, CN has applied for patents for these inventions. The list has both pending applications and granted patents:
Method for efficiently preparing doped optical fibre preform and doped optical fibre preform
#2 | 2017-04-27Low-loss few-mode fiber
#3 | 2016-06-23High-efficiency parallel-beam laser optical fibre drawing method and optical fibre
2330133 ⎘