Low-temperature slow-cooking microwave oven
Restrictive insert for microwave ovens
High-frequency heating apparatus
Heat sensor for measuring the temperature of a product heated in a microwave oven
Microwave oven with moving equipment, and an accessory for the oven
Method of producing heat with microwaves
Microwave heating apparatus for laboratory analyses Patent #: 4835354
ApplicationNo. 786007 filed on 10/31/1991
US Classes:219/710, Temperature219/712, Probe219/756, Enclosed cavity structure219/762, Load support373/136, Temperature374/149With cooking compartment or door thereof (e.g., oven)
ExaminersPrimary: Leung, Philip H.
Attorney, Agent or Firm
International ClassH05B 006/68
AbstractA high speed microwave high temperature oven system mounts an enclosed furnace in its cavity and extends a temperature probe therein. A controller regulates the furnace temperature by periodically interrupting over a range, the operation of the magnetron as the furnace or actual temperature approaches the setpoint. It interrupts the operation of the magnetron for longer periods of time as the actual temperature nears the setpoint. If the actual temperature exceeds the setpoint, the operation of the magnetron is interrupted for even longer periods of time. The controller at a selected furnace temperature also activates an exhaust function to remove hot air, smoke and fumes from and draw clean air into the furnace. As the actual temperature lowers towards the setpoint, the controller shortens the period of magnetron operation interruption. When the furnace temperature cools to a safe temperature, the controller shuts off the exhaust function. The range of periodic operation of the magnetron is automatically adjusted on a large difference between the actual temperature and the setpoint temperature. The range may also be shifted if the stable point temperature differs from the set point. The furnace is a box-like structure having a removable front door, and is formed of ceramic materials. Silicon carbide tiles within the furnace absorb microwave radiation to heat up the furnace.