Portable stool

I claim the ornamental design for a portable stool, as shown and described.

FIG. 1 is a perspective view of a portable stool.

FIG. 2 is a front elevation view of the portable stool.

FIG. 3 is a first side elevation view of the portable stool.

FIG. 4 is a rear elevation view of the portable stool.

FIG. 5 is a second elevation view of the portable stool opposite the first side elevation view; and,

FIG. 6 is a top plan view of the portable stool.

The broken lines shown in the drawings depict environmental features that form no part of the claimed design.

Patent	Priority	Assignee	Title
106780,
174695,
232880,
D367789,	Apr 13 1994	OAKTREE CAPITAL MANAGEMENT, LLC	Swivel mechanism for rotating chair or stool seat
D396565,	Apr 30 1997	PRESCRIPTIVES INC	Custom stool
D535828,	Aug 08 2005		Tabouret
D579676,	May 31 2007	Steelcase Development Corporation	Stool
D693136,	Oct 01 2012		Furniture article

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