Liping LIU

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Langfang, CN

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Patents Grantslast 30 patents

Information Patent Grant
Hydraulic power system for downhole device and downhole device
- Patent number 12,025,159
- Issue date Jul 2, 2024
- China Oilfield Services Limited
- Zhibin Tian
- F15 - FLUID-PRESSURE ACTUATORS HYDRAULICS OR PNEUMATICS IN GENERAL
Information Patent Grant
Wire follow-up protection structure of electric reducer
- Patent number 10,236,667
- Issue date Mar 19, 2019
- China National Offshore Oil Corporation
- Yongren Feng
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Drilling type sidewall coring apparatus
- Patent number 10,018,038
- Issue date Jul 10, 2018
- China National Offshore Oil Corporation
- Yongren Feng
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
HYDRAULIC POWER SYSTEM FOR DOWNHOLE DEVICE AND DOWNHOLE DEVICE
- Publication number 20220260094
- Publication date Aug 18, 2022
- China Oilfield Services Limited
- Zhibin TIAN
- F15 - FLUID-PRESSURE ACTUATORS HYDRAULICS OR PNEUMATICS IN GENERAL
Information Patent Application
WIRE FOLLOW-UP PROTECTION STRUCTURE OF ELECTRIC REDUCER
- Publication number 20180323589
- Publication date Nov 8, 2018
- CHINA NATIONAL OFFSHORE OIL CORPORATION
- Yongren Feng
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Application
Drilling Type Sidewall Coring Apparatus
- Publication number 20170107813
- Publication date Apr 20, 2017
- CHINA OILFIELD SERVICES LIMITED
- Yongren FENG
- E21 - EARTH DRILLING MINING