Microwave heating method and apparatus
US4454403A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 1, 1980 |
| Grant date | Jun 12, 1984 |
| Priority date | — |
| Expiry date | Dec 1, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S99/14
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A microwave cooking container comprising a conductive layer to which is bonded a layer of material having high hysteresis loss at microwave frequencies. When subjected to microwave radiation the hysteresis loss material heats to its Curie point where its loss is substantially reduced while the dielectric loss is minimized by being effectively shielded by its proximity to the surface of the conductive layer. The conductive layer may be a metal dish cover whose outer surface supports a plastic bonded ferrite and whose inner surface contacts a food body in a metal dish. The Curie point region of the ferrite is lower than the degradation temperature of the plastic. Overlapping the walls of the dish and cover forms a microwave seal to prevent microwave heating of the dish contents.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.