Zhanguo Ma

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Beijing, CN

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Patents Grantslast 30 patents

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...
Information Patent Grant
Fiber-reinforced prestressed reinforced concrete sleeper
- Patent number 11,136,724
- Issue date Oct 5, 2021
- CHINA ACADEMY OF RAILWAY SCIENCES CORPORATON LIMITED RAILWAY ENGINEERING RESE...
- Yangsheng Ye
- E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES

Patents Applicationslast 30 patents

Information Patent Application
FIBER-REINFORCED PRESTRESSED REINFORCED CONCRETE SLEEPER
- Publication number 20210123191
- Publication date Apr 29, 2021
- CHINA ACADEMY OF RAILWAY SCIENCES CORPORATION LIMITED RAILWAY ENGINEERING RES...
- Yangsheng YE
- E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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...