Ladder extension

The ornamental design for a ladder extension, as shown.

FIG. 1 is a perspective view of a ladder extension showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

Patent	Priority	Assignee	Title
7267197,	Sep 25 2002		Add-on extension ladder
D420752,	Jul 09 1998		Scaffolding leg extension
D468448,	Feb 01 2002		Adjustable ladder leg attachment
D479339,	Dec 10 2002		Telescoping ladder leg extender having mated toothed elements and self-leveling foot for uneven terrain
D485369,	Apr 28 2003		Pair of leveling ladder leg attachments
D507836,	Jun 10 2004		Adjustable ladder leveling extension
D776827,	Aug 11 2015	LOBO Systems Limited	Extendable scaffold leg
D781451,	Aug 11 2015	LOBO Systems Limited	Scaffold leg with base plate
D808042,	Sep 07 2016	LANZAFAME, PHILIP F	Adjustable ladder extension
D869688,	Sep 07 2016	Philip F., Lanzafame	Adjustable ladder extension

Patent	Priority	Assignee	Title
4723629,	Feb 13 1987	Vernon M., Vanden Hoek	Extension ladder with auxiliary extension leg and supporting legs
D341664,	Aug 14 1991		Adjustable ladder foot

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