Building block

The ornamental design for a building block, as shown.

FIG. 1 is a perspective view of a building block embodying my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is an end elevational view thereof;

FIG. 4 is a bottom plan view thereof; and

FIG. 5 is a front elevational view thereof.

Patent	Priority	Assignee	Title
D264886,	Apr 30 1980	FELDMAN, CALVIN; FELDMAN, HAROLD	Interlocking reinforced brick
D542405,	Sep 11 2006	Saint-Gobain Ceramics and Plastics, Inc.	H-support block
D829248,	Feb 18 2016	FSBL ACQUISITION, INC ; FOSBEL, INC	Regenerator wall block
D916153,	Feb 18 2016	FSBL ACQUISITION, INC ; FOSBEL, INC	Regenerator wall block
D956838,	Feb 18 2016	Fosbel, Inc.; DSF REFRACTORIES AND MINERALS LIMITED	Regenerator wall block

Patent	Priority	Assignee	Title
3204381,
3318059,
4071989,	Jan 19 1976	Warren Insulated Bloc, Inc.	Sound insulative masonry block

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