Building units and construction elements – Stair – ladder – scaffold – or similar support – Stepped
Design Patent
2001-08-08
2002-05-21
Clark, Doris (Department: 2914)
Building units and construction elements
Stair, ladder, scaffold, or similar support
Stepped
Design Patent
active
D0457650
CLAIM:
I claim the ornamental design for an uneven surface ladder, as shown and described.
REFERENCES:
patent: 1329740 (1920-02-01), Barron
patent: 2147052 (1939-02-01), Noone
patent: 3173512 (1965-03-01), Sturdy et al.
patent: D238298 (1975-12-01), Larson
patent: 4249638 (1981-02-01), Fernandez
patent: 4683980 (1987-08-01), Vayko
patent: 4807720 (1989-02-01), Kim
patent: 5044468 (1991-09-01), Worthington, Jr.
patent: 5335754 (1994-08-01), Gibson
Clark Doris
Schoonover Donald R.
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