Lihua HAN

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Xuzhou, CN

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Patents Grantslast 30 patents

Information Patent Grant
Double-walled drill pipe and drilling machine
- Patent number 11,268,328
- Issue date Mar 8, 2022
- XUZHOU XUGONG FOUNDATION CONSTRUCTION MACHINERY CO., LTD
- Ming Yang
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
TEST DEVICE AND METHOD FOR TESTING AND COMMISSIONING COMPREHENSIVE...
- Publication number 20230251166
- Publication date Aug 10, 2023
- XUZHOU XUGONG FOUNDATION CONSTRUCTION MACHINERY CO., LTD.
- Jun LI
- E21 - EARTH DRILLING MINING
Information Patent Application
DOUBLE-WALLED DRILL PIPE AND DRILLING MACHINE
- Publication number 20210310315
- Publication date Oct 7, 2021
- XUZHOU XUGONG FOUNDATION CONSTRUCTION MACHINERY CO., LTD.
- Ming YANG
- E21 - EARTH DRILLING MINING