Step stool

Design Patent

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Design Patent

active

D0609927

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

REFERENCES:
patent: D184390 (1959-02-01), Cramer
patent: 3559761 (1971-02-01), Wehner
patent: 3599750 (1971-08-01), Serwer
patent: 3721315 (1973-03-01), Wehner
patent: D335966 (1993-06-01), Schwartzkopf et al.
patent: D337211 (1993-07-01), Bergkvist
patent: D354210 (1995-01-01), Dickinson et al.
patent: D359863 (1995-07-01), Marlor
patent: D524069 (2006-07-01), Lim
patent: D553370 (2007-10-01), Meyers et al.
patent: D566977 (2008-04-01), Emge
patent: D570125 (2008-06-01), Gonzalez
patent: D582168 (2008-12-01), Sandel

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