The ornamental design for a cooktopgrate, as shown and described.
FIG. 1 is a front perspective view of a cooktop grate in an environment of use on a cooking appliance, showing our new design;
FIG. 2 is a top perspective view of the cooktop grate shown separately;
FIG. 3 is a top view thereof;
FIG. 4 is a bottom view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a front view thereof;
FIG. 8 is a rear view thereof;
FIG. 9 is a top perspective view of the cooktop grate in an alternative configuration—a wok mode;
FIG. 10 is a top perspective view of the cooktop grate in an alternative configuration—a melt mode; and,
FIG. 11 is a rear view thereof.
The broken line showing of the cooking appliance in FIG. 1 depicts the environment of use for the cooktop grate and forms no part of the claimed design. The broken lines in FIG. 4 depict portions of the cooktop grate that form no part of the claimed design.