Button fastener

The ornamental design for a button fastener, as shown and described.

FIG. 1 is a perspective view of a button fastener showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side elevational view thereof, the opposite side being a mirror image;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

Patent	Priority	Assignee	Title
10159371,	Jun 16 2016		Integrated buttoning assist and unbuttoning assist tool
10722060,	Jun 16 2016		Integrated buttoning assist and unbuttoning assist tool
10827820,	May 04 2017		Device for keeping eye glasses on person
6169237,	Sep 14 1999		Scratch board musical instrument and playing implement
7721394,	Oct 28 2005	Snyder National Corporation	Button tool
D401389,	Aug 11 1997	APEX MEDICAL CORP	Zipper and button puller
D406685,	Oct 31 1997		Zipper puller
D415332,	Oct 16 1998		Wedding gown button looper
D415873,	Oct 16 1998		Wedding gown bustle looper
D485964,	Mar 04 2003		Buttoner
D553849,	Oct 28 2005	Snyder National Corporation	Button tool
D624801,	Oct 15 2009		Door knob adapter
D702592,	Apr 26 2013		Buttoning tool
D812345,	Nov 17 2016		Sock donning aid

Patent	Priority	Assignee	Title
1540810,
4942646,	Sep 29 1988		Shirt collar buttoning device
5209667,	Mar 12 1990		Teaching shoelace
5276948,	Oct 14 1992		Buttoning device
5347688,	Sep 21 1993		Clothing fastener apparatus
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25602,
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