Stackable wall block

I claim the ornamental design for a stackable wall block, as shown.

FIG. 1 is a perspective view of a stackable wall block showing my new design.

FIG. 2 is a front view thereof.

FIG. 3 is a rear view thereof.

FIG. 4 is a bottom view thereof.

FIG. 5 is a top view thereof; and,

FIG. 6 is a side view thereof.

The broken lines appearing in the figures are not intended to form part of the claimed design and are provided for illustrative purposes only.

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Executed on	Assignor	Assignee	Conveyance	Frame	Reel	Doc
May 10 2006	PRICE, MR BRIAN A	Rockwood Retaining Walls, Inc	ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS	017909	0830	pdf
May 19 2006		Mortarless Technologies, LLC	(assignment on the face of the patent)
Apr 12 2007	Rockwood Retaining Walls, Inc	Mortarless Technologies LLC	ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS	019153	0876	pdf
Jun 25 2009	Mortarless Technologies LLC	HOME FEDERAL SAVINGS BANK	SECURITY AGREEMENT	022902	0555	pdf

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