Step ladder

Building units and construction elements – Stair – ladder – scaffold – or similar support – Stepped

Design Patent

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Design Patent

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D0576290

CLAIM:
The ornamental design for a step ladder, as shown and described.

REFERENCES:
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patent: D449385 (2001-10-01), Rosko
patent: 6390238 (2002-05-01), Gibson et al.
patent: 6427805 (2002-08-01), Gibson et al.
patent: 6443261 (2002-09-01), Gibson et al.
patent: D466225 (2002-11-01), Rosko
patent: 6536557 (2003-03-01), Gibson et al.
patent: 6550579 (2003-04-01), Gibson et al.

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