Step ladder

Details Step ladder Step ladder

1997-06-05

1998-11-17

Clark, Doris

Building units and construction elements

Stair, ladder, scaffold, or similar support

Stepped

D25 65, 2504

Patent

active

D04013530

REFERENCES:
patent: D236244 (1975-08-01), Lay
patent: 4205411 (1980-06-01), Cupp et al.
patent: 4276955 (1981-07-01), Hickman
patent: 4485892 (1984-12-01), Maloney et al.
patent: 4557350 (1985-12-01), Wang
patent: 4653713 (1987-03-01), Hamilton
patent: 4706918 (1987-11-01), Wilson
patent: 4730802 (1988-03-01), Chatham et al.
patent: 4979590 (1990-12-01), Bailey
patent: 5370263 (1994-12-01), Brown
patent: 5421429 (1995-06-01), Evans
patent: 5542535 (1996-08-01), Dalton
patent: 5542553 (1996-08-01), Penniman
Cosco brochure, ladder model No. 11-740 "Tri Step Work Platform" (1995).
Cosco brochure, ladder model No. 11-780 "Pro Step" (1995).
Cosco brochure, "Pro Fold" ladder (1995).
Cosco brochure, ladder model No. 11-725 (1995).
Cosco brochure, ladder models 11-300 and 11-307 (1995).
Cosco brochure, ladder models 11-135 and 11-302 (1995).
U.S. Design Patent Application No. 29/048,682 filed Jan. 11, 1996.

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