Chengdu
China
5
2023-01-03
The entities that hold a legal rights for patent applications filed by inventor Wu Lingfeng:
Lingfeng Wu from Chengdu, CN has applied for patents for these inventions. The list has both pending applications and granted patents:
Leak-proof lost-circulation control water-based drilling fluid composition and preparation method and use thereof
#2 | 2022-09-15Oil-based drilling fluid composition, oil-based drilling fluid and preparation method and use thereof
#3 | 2022-08-25Pressure-bearing plugging agent and preparation method and use thereof
#4 | 2022-07-26Pressure-bearing plugging composition, pressure-bearing plugging slurry and preparation method and use thereof
#5 | 2022-05-31Fiber silica composite microsphere for shale stratum, drilling fluid and preparation method and use thereof
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