Sichuan
China
3
2024-07-04
The entities that hold a legal rights for patent applications filed by inventor Chen Chen:
Chen Chen from Sichuan, CN has applied for patents for these inventions. The list has both pending applications and granted patents:
Differential pressure sliding sleeve, and oil and gas well fracturing construction method using same
#2 | 2023-10-05Sliding sleeve device
#3 | 2021-03-04Self-adaptive luggage transfer device and system
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