The ornamental design for ultraviolet sterilizer, as shown and described.
1. Ultraviolet sterilizer
1.1 : Perspective
1.2 : Front
1.3 : Back
1.4 : Left
1.5 : Right
1.6 : Top
1.7 : Bottom
The object of the present design is made of metals and synthetic resins; the object of the present design is an ultraviolet sterilizer for use in sterilizing any kind of bedding with ultraviolet rays emitted from the bottom of the object of the present design; the object of the present design is curved so that the user can use the object without holding it, and an ultraviolet lamp can be spaced a preset interval from the bottom; Fig. 1.1 is an overall view of the object of the present design, fig. 1.2 is a front view of the object of the present design, fig. 1.3 is a rear view of the object of the present design, fig. 1.4 is a left side view of the object of the present design, fig. 1.5 is a right side view of the object of the present design, fig. 1.6 is a plan view of the object of the present design, and fig. 1.7 is a bottom view of the object of the present design.
The broken lines in the drawings illustrate portions of the ultraviolet sterilizer and form no part of the claimed design.