Step ladder

Details Step ladder Step ladder

2008-12-05

2009-12-22

Clark, Doris (Department: 2914)

Building units and construction elements

Stair, ladder, scaffold, or similar support

Stepped

Design Patent

active

D0606669

CLAIM:
The ornamental design for the “step ladder”, as shown and described.

REFERENCES:
patent: 3435570 (1969-04-01), Berry
patent: 4157743 (1979-06-01), Masuda et al.
patent: 6386320 (2002-05-01), Clavel
patent: D458385 (2002-06-01), Rosko

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