Patent 7642488 was granted and assigned to LG on January, 2010 by the United States Patent and Trademark Office.
An electric oven includes a cooking cavity surrounded by an inner case and being openable by a door; a first heater for heating the cooking cavity; at least one supplemental heater for heating the cooking cavity; and a controller operating the first heater to generate heat when starting cooking and selectively operating the at least one supplemental heater during cooking.