Microwave field director structure having vanes with inner ends wrapped with a conductive wrapper
US8455802B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 10, 2008 |
| Grant date | Jun 4, 2013 |
| Priority date | — |
| Expiry date | Apr 4, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B6/74
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A reusable self-supporting field director for use in a microwave oven is characterized by a plurality of vanes, each extending radially outwardly from a central axis. The vanes are supported in a slotted central support member. Each vane has a predetermined thickness dimension. Each vane comprises a substrate formed from an electrically non-conductive material having a predetermined coefficient of thermal expansion and an electrically conductive wrapper having a predetermined coefficient of thermal expansion that is different from the coefficient of thermal expansion of the substrate. The wrapper wraps the substrate so that a portion of the first and second major surfaces are covered and the radially inner end of each vane is wrapped by an electrically conductive material. The wrapper and the substrate are arranged in a laterally symmetric fashion so that thermal expansion effects due to heating are equalized across the thickness of each vane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.