Corner block for a block structure

The ornamental design for a corner block for a block structure, as shown and described.

FIG. 1 is a rear perspective view of the corner block for a block structure.

FIG. 2 is a front perspective view of the corner block.

FIG. 3 is a top plan view of the corner block.

FIG. 4 is a front elevational view of the corner block.

FIG. 5 is a bottom plan view of the corner block; and,

FIG. 6 is a rear elevational view of the corner block.

Patent	Priority	Assignee	Title
D796066,	Aug 15 2016		Building block
D829933,	Nov 30 2016	TREMCO ACQUISITION, LLC	Brick
D829934,	Oct 18 2016	ANCHOR WALL SYSTEMS, INC	Concrete building block
D833645,	Feb 23 2017	GOUDA-TORGERSON BUILDING SYSTEMS LLC	Modular mold
D833646,	Feb 23 2017	GOUDA-TORGERSON BUILDING SYSTEMS LLC	Modular mold
D833647,	Feb 23 2017	GOUDA-TORGERSON BUILDING SYSTEMS LLC	Modular mold
D857130,	Dec 04 2017	Life Fitness, LLC	Exercise dumbbell
ER3044,
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