Liguo Chen

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Shanghai, CN

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Patents Grantslast 30 patents

Information Patent Grant
Negative pressure pipeline opening and closing device
- Patent number 11,448,338
- Issue date Sep 20, 2022
- Shanghai ZTEC Environmental S&T CO., LTD.
- Liguo Chen
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...

Patents Applicationslast 30 patents

Information Patent Application
Negative Pressure Pipeline Opening and Closing Device
- Publication number 20220381365
- Publication date Dec 1, 2022
- Shanghai ZTEC Environmental S&T CO., LTD.
- Liguo Chen
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Application
Negative Pressure Pipeline Opening and Closing Device
- Publication number 20210071777
- Publication date Mar 11, 2021
- Shanghai ZTEC Environmental S&T CO., LTD.
- Liguo Chen
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...