Ladder extension

Details Ladder extension Ladder extension

2009-04-07

2010-02-23

Clark, Doris (Department: 2914)

Building units and construction elements

Stair, ladder, scaffold, or similar support

Element or attachment

Design Patent

active

D0610709

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

REFERENCES:
patent: 3866714 (1975-02-01), Waldron
patent: 4284171 (1981-08-01), Owen
patent: 4926964 (1990-05-01), Herrin
patent: 5454446 (1995-10-01), Zelikovitz
patent: D364930 (1995-12-01), Burge et al.
patent: 6698550 (2004-03-01), Crain
patent: 6702066 (2004-03-01), Eaton

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