Rear bumper for an automobile

FIG. 1 is a first perspective view of a rear bumper for an automobile, showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a right side elevational view thereof; and,

FIG. 6 is a left side elevational view thereof.

De-emphasized potions using lightened halftone shading and encapsulated with broken lines shown in the drawings depict portions of the rear bumper for an automobile that form no part of the claimed design. The grayscale shading of the drawings depict the shape of the three-dimensional surface and does not represent any particular colors.