TREA

Hung-Chieh Chao

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  • Hsinchu County, TW
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Patents Grantslast 30 patents

  • Information Patent Grant

    Device of bi-spiral cleaning brush
    • Patent number 11,109,667
    • Issue date Sep 7, 2021
    • Tung An Development Ltd.
    • Chih-An Ku
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    Device of cleaning brush
    • Patent number 10,758,946
    • Issue date Sep 1, 2020
    • Tung An Development Ltd.
    • Chih-An Ku
    • H01 - BASIC ELECTRIC ELEMENTS

Patents Applicationslast 30 patents

  • Information Patent Application

    Device Having Cleaning Bodies
    • Publication number 20230178360
    • Publication date Jun 8, 2023
    • TUNG AN DEVELOPMENT LTD.
    • Chih-An Ku
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Application

    Device of Bi-Spiral Cleaning Brush
    • Publication number 20210112961
    • Publication date Apr 22, 2021
    • TUNG AN DEVELOPMENT LTD.
    • Chih-An Ku
    • A46 - BRUSHWARE
  • Information Patent Application

    Device of Cleaning Brush
    • Publication number 20200230656
    • Publication date Jul 23, 2020
    • TUNG AN DEVELOPMENT LTD.
    • Chih-An Ku
    • B08 - CLEANING