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Wei DANG

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  • Tianjin, CN
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Patents Grantslast 30 patents

  • Information Patent Grant

    Multi-level sliding sleeve
    • Patent number 9,366,110
    • Issue date Jun 14, 2016
    • CNPC Bohai Drilling Engineering Company Limited
    • Qiang Feng
    • E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

  • Information Patent Application

    MULTI-LEVEL SLIDING SLEEVE
    • Publication number 20140182838
    • Publication date Jul 3, 2014
    • CNPC Bohai Drilling Engineering Company Limited
    • Qiang FENG
    • E21 - EARTH DRILLING MINING