Microwave oven with co-located microwave and hot air launch site
US5434391A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 11, 1994 |
| Grant date | Jul 18, 1995 |
| Priority date | — |
| Expiry date | Mar 11, 2014 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF24C15/325
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A microwave oven has a food-receiving cavity the rear panel of which is apertured to provide a launch area for the entry of microwave power to the cavity from a magnetron. A metal plate is positioned in front of a launch area, a central area of the plate having apertures. A forced hot air system comprising a fan and an electrical resistance heating element are positioned between the launch area and the plate. In use, the plate acts as a baffle plate for the hot air system and also as a mis-match plate for the microwave power, so that the dielectric load of food items placed in the cavity determines the microwave power coupled to the loaded oven from the magnetron.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.