The ornamental design for a cloud patterned lightbulb, as shown and described.
FIG. 1 is a perspective top view of a light bulb showing our new design, wherein the cloud pattern on the surface of the light bulb is a different color than the background color.
FIG. 2 is a perspective bottom view of the cloud patterned light bulb.
FIG. 3 is a top plan view of the cloud patterned light bulb.
FIG. 4 is a bottom plan view of the cloud patterned light bulb.
FIG. 5 is a side elevational view of the cloud patterned light bulb.
FIG. 6 is a side, cross-sectional view of the cloud patterned light bulb taken from the line 6-6 in FIG. 5.
FIG. 7 is a side view of a minimally modified variation of the cloud patterned light bulb of FIG. 1.
FIG. 8 is a side view of a minimally modified variation of the cloud patterned light bulb of FIG. 1.
FIG. 9 is a side view of a minimally modified variation of the cloud patterned light bulb of FIG. 1.
FIG. 10 is a side view of a minimally modified variation of the cloud patterned light bulb of FIG. 1; and,
FIG. 11 is a side view of a minimally modified variation of the cloud patterned light bulb of FIG. 1.
The broken lines in the drawings depict parts of the cloud patterned light bulb that form no part of the claimed design.