Method of determining resonant lengths of microwave shielding material
US4934829A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 10, 1989 |
| Grant date | Jun 19, 1990 |
| Priority date | — |
| Expiry date | Apr 10, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D2581/3489
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A food container for use in a microwave oven is disclosed. The container contains a plurality of food substances, and employs a metal shield to shield at least one of the food substances from microwave radiation. Arcing and other problems associated with the use of metal shielding are avoided by proper selection of the geometry of the metal shield. The metal shield is preferably looped in a manner which provides some electrical inductance, and the ends of the metal shield are overlapped and separated by a dielectric material to provide some electrical capacitance. The geometry of the shield is selected so that the inductance and the capacitance in effect form a "tuned circuit" which minimizes problems associated with resonance and which eliminates arcing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.