TREA

Haison Yuen

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  • Pintung Hsien, TW
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Patents Grantslast 30 patents

  • Information Patent Grant

    Ladder structure
    • Patent number 5,002,153
    • Issue date Mar 26, 1991
    • Haison Yuen
    • E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
  • Information Patent Grant

    Folding ladder
    • Patent number 4,947,959
    • Issue date Aug 14, 1990
    • Haison Yuen
    • E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
  • Information Patent Grant

    Adjustable folding ladder
    • Patent number 4,842,098
    • Issue date Jun 27, 1989
    • Haison Yuen
    • E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS