The ornamental design for a knob for cookingutensil, as shown and described.
FIG. 1 is a front elevational view of a knob for cooking utensil showing our new design, the rear elevational view being the same as FIG. 1 except for the presence of a recess in the lower peripheral edge as shown in FIGS. 4 and 5;
FIG. 2 is a view thereof from the right side of FIG. 1, the left side view being a mirror image thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof; and,
FIG. 5 is a top, front and left side perspective view thereof.
The broken lines immediately adjacent the shaded areas represent the bounds of the claim and all other broken lines represent unclaimed portions of the design. None of the broken lines form a part of the claimed design.