Patent Publication Number: US-D542221-S

Title: Portable backup power supply

Description:
FIG. 1 is a perspective view of an portable backup power supply according to our new design; 
       FIG. 2 is a front elevational view of the portable backup power supply of FIG. 1; 
       FIG. 3 is a top plan view of the portable backup power supply of FIG. 1; 
       FIG. 4 is a bottom view of the portable backup power supply of FIG. 1; 
       FIG. 5 is a rear elevational view of the portable backup power supply of FIG. 1; 
       FIG. 6 is a left hand side elevational view of the portable backup power supply of FIG. 1; and, 
       FIG. 7 is a right hand side elevational view of the portable backup power supply of FIG. 1. 
       The broken lines which define the bounds of the claimed design form no part thereof.