Yun Ling

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Beijing, CN

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Patents Grantslast 30 patents

Information Patent Grant
Method for preparing 3,3′-diaminobenzidine
- Patent number 11,981,616
- Issue date May 14, 2024
- Hubei Huida High-Tech Co., Ltd
- Yun Ling
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Method for lowering oil pipe in gas well without well-killing, solu...
- Patent number 11,313,192
- Issue date Apr 26, 2022
- PetroChina Company Ltd.
- Xianwen Li
- C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...

Patents Applicationslast 30 patents

Information Patent Application
METHOD FOR PREPARING 3,3'-DIAMINOBENZIDINE
- Publication number 20240109835
- Publication date Apr 4, 2024
- HUBEI HUIDA HIGH-TECH CO., LTD.
- Yun LING
- C07 - ORGANIC CHEMISTRY
Information Patent Application
METHOD FOR LOWERING OIL PIPE IN GAS WELL WITHOUT WELL-KILLING, SOLU...
- Publication number 20200040682
- Publication date Feb 6, 2020
- PetroChina Company Ltd.
- Xianwen Li
- C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...