4. Building units and construction elements
  5. Stair, ladder, scaffold, or similar support
  6. Element or attachment

Chen-Nung Tseng

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Tread and handrail combination structure of a staircase

Static structures (e.g. – buildings) – Stepped; e.g. – stair – Helical type
Reexamination Certificate

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Tread of a staircase

Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Design Patent

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Profile ID: LFUS-PAI-P-2450666

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