Patent ID: 7614522

Claim:
A container structure comprising: a lid; a holder; wherein the lid has a recess having an annular sidewall terminating in a bottom having an inner surface and an outer surface opposite to the inner surface, with a through hole formed in the bottom extending between the inner and outer surfaces and having a periphery spaced from the annular sidewall, with a plurality of air-permeable troughs extending from the periphery of the through hole, wherein each air-permeable trough is generally L-shaped having first and second legs, with the first legs extending between the inner and outer surfaces of the bottom, with the second leg extending from the first leg on the inner surface of the bottom for one of adjacent air-permeable troughs and with the second leg extending from the first leg on the outer surface of the bottom for another of adjacent air-permeable troughs; and an elastic plug fitted into the though hole, forming an air-permeable passageway; whereby, when heated, ventilation can be achieved by the air-permeable passageway of the lid and high-temperature circular vapors generated from microwave heating are regulated and vented, thereby preventing the lid from being blown open by the vapors accumulated within the holder.