Abstract: A cooking oven, wherein air in a cooking chamber is sucked into a blower on the outside of the cooking chamber and fed to an upper duct and a lateral duct, air current led into the upper duct is heated by an upper heater and re-circulated from an upper blowing port to the cooking chamber, a catalyst block heated by a catalyst heating heater is disposed in the upper duct to decompose lamp black and smell substances contained in the air current, catalyst paint is applied onto the inner wall surface of the upper duct to reinforce a performance for decomposing the lamp black and smell substances, both the lateral duct and the upper duct are formed in the same structure, the distributions of heating volumes of the upper heater and the lateral heater in the cross sections of the upper duct and the lateral duct are set so that larger heating volumes are generated on larger air volume sides according to the air volume distributions in the cross sections of the ducts, and the catalyst block is also disposed in the cro

Abstract: A cooking oven, wherein air in a cooking chamber is sucked into a blower on the outside of the cooking chamber and fed to an upper duct and a lateral duct, air current led into the upper duct is heated by an upper heater and re-circulated from an upper blowing port to the cooking chamber, a catalyst block heated by a catalyst heating heater is disposed in the upper duct to decompose lamp black and smell substances contained in the air current, catalyst paint is applied onto the inner wall surface of the upper duct to reinforce a performance for decomposing the lamp black and smell substances, both the lateral duct and the upper duct are formed in the same structure, the distributions of heating volumes of the upper heater and the lateral heater in the cross sections of the upper duct and the lateral duct are set so that larger heating volumes are generated on larger air volume sides according to the air volume distributions in the cross sections of the ducts, and the catalyst block is also disposed in the cro

Abstract: A microwave oven includes a heating chamber in which food is heated, a high frequency heating circuit for supplying high frequency energy to the heating chamber, a thermal heater provided in each of the upper and lower areas of the heating chamber, a switching circuit for selecting the high frequency heating circuit or the thermal heaters, a first switching circuit for permitting intermittent power to the high frequency heating circuit when the high frequency heating circuit is selected by the switching circuit, a second switching circuit connected in parallel with the first switching circuit so as to provide a bypass of the first switching circuit when closed, a first contact mounted in the first switching circuit to permit intermittent power supply to one of the two thermal heaters in the heating chamber, and a second contact mounted in the second switching circuit to provide a bypass of the first contact.

Abstract: A combination compact microwave oven incorporates ventilator and cooling systems into a unitized structure which may typically be installed on a wall above a conventional electric or gas range. A ventilator assembly including centrifugal fans at the top backward edge is rotatably adjustable for different installations. The space under an outer housing is utilized as an exhaust duct containing a filter means through which exhaust gas can be discharged if there is no external vent available. Air is taken into the cooling system from above through an opening where relatively cool air is expected to be available and is passed through separate air flow channels for efficient cooling of individual areas and components.

Abstract: A microwave oven comprises a magnetron for microwave cooking purposes, a heater disposed in an oven cavity for electric heating cooking purposes, and a digital control system including a semiconductor microprocessor for controlling operation of the magnetron and the heater in accordance with a desired program. A cooling fan is driven to rotate to cool the semiconductor microprocessor during the electric heating cooking operation and for a predetermined period of time subsequent to the completion of the electric heating cooking operation.