The ornamental design for a case for ozonegenerator, as shown and described.
FIG. 1 is a front perspective view of a case for ozone generator according to the present invention.
FIG. 2 is a front view of the case of FIG. 1.
FIG. 3 is a rear view of the case of FIG. 1.
FIG. 4 is a first side view of the case of FIG. 1.
FIG. 5 is a second side view of the case of FIG. 1, opposite the first side shown in FIG. 4.
FIG. 6 is a top view of the case of FIG. 1; and,
FIG. 7 is a bottom view of the case of FIG. 1.
The broken line showing of parts of the drawings is included for the purpose of illustrating use and environment and forms no part of the claimed design.