Microwave ovens and methods of cooking foods
US4508947A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 13, 1983 |
| Grant date | Apr 2, 1985 |
| Priority date | — |
| Expiry date | Jul 13, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B6/645
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A portable microwave oven is designed to be powered from a domestic power socket with a rating not exceeding 1800 watts for the U.S. market, or not exceeding 3000 watts for the U.K. market. The oven comprises a microwave generator for supplying microwave power to an oven cavity, a thermal heating element capable of heating the air within the oven cavity, a fan for forcing a recirculating flow of air over the heating element and in a continuous flow which within the oven cavity turns 180.degree. over and around food on a turntable rotating in a direction opposite to the air flow which is then reheated and recycled, and a control circuit operative to supply continuous microwave power to the oven cavity selectively simultaneously with or separate from the supply of thermal power to the cavity. The microwave power heats the inside of the food and the thermal power dissipates the resulting moisture and browns the external surface of the food. Due to the circulation of heated air being concentrated away from the cavity's walls, they remain relatively cool and following completion of cooking food, cooler air is circulated in the cavity to reduce its temperature so it can be used again in …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.