Portable refrigerator

We claim the ornamental design for a portable refrigerator, as shown and described.

FIG. 1 is a perspective view of a first embodiment of a portable refrigerator, showing my new design in a closed door position;

FIG. 2 is a another perspective view thereof, shown in an open door position;

FIG. 3 is a perspective view of a second embodiment of a portable refrigerator, showing my new design in a closed door position; and,

FIG. 4 is another perspective view thereof, shown in an open door position.

Patent	Priority	Assignee	Title
D893557,	Jul 26 2018	Menaliz	Refrigerated box for cosmetics
D905159,	Nov 15 2017	VIATOUCH MEDIA, INC	Vending machine
D958848,	Dec 06 2019	IRINOX S P A	Refrigeration apparatus
D984495,	Dec 13 2019	HAMILTON STORAGE GMBH	Refrigerating apparatus

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