A protective cover for a dish being heated in a microwave oven is formed of moisture-absorbent, microwave transparent material forming a top member and an encircling wall member depending downwardly from the periphery of the top member to completely cover the dish to protect the interior of the oven...http://www.google.es/patents/US4801773?utm_source=gb-gplus-sharePatente US4801773 - Shroud to cover dish in microwave oven
