Patent ID: 8729438

Claim:
A cover for covering an opening of a container for heating a food stuff comprising: an elevated peripheral portion defining an outer contour of the cover and configured to engage with an edge of the container defining its opening, an elevated area surrounded by and positioned apart from the elevated peripheral portion, the elevated area being lower than the peripheral portion, an intermediate area extending from the elevated peripheral portion to the elevated area, the intermediate area being lower than the elevated area, at least one air vent port defined in the elevated area, at least one flap including a proximal end formed continuously with an edge of the elevated area, the at least one flap configured to rotate around the proximal end, a protrusion extending from a first surface of the at least one flap and configured to plug the at least one air vent port when the flap reaches a first position where the at least one flap is received in a concave area defined in the elevated area, a groove defined at the proximal end in the first surface of the at least one flap wherein a second surface opposite to the first surface at the proximal end is straight when the flap stands upright to the concave area.