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US 2007/0181568 A1Published application
Field director assembly having overheating protection
AssigneeE. I. DuPont de Nemours and Company
InventorsNicole Blankenbeckler, William Corcoran, Dariusz Kawka
Life of this patent
Estimating the term…
Abstract
A field director assembly includes electrically conductive vanes positioned with respect to each other and to a planar support member to prevent overheating of the susceptor in an unloaded microwave oven.
Claims20
A field director assembly for use in heating an article in a microwave oven, the field director assembly comprising:
- a generally planar support member having a geometric center;
- a field director structure comprising a plurality of vanes each mechanically connected to the support member, at least a portion of each vane being electrically conductive, the electrically conductive portion of the vane being disposed at least a predetermined close distance from the support member,
- the electrically conductive portion of each vane having a first end and a second end, the first end of the conductive portion on each of the vanes being disposed at a distance at least a predetermined separation distance from the geometric center of the planar support member,
- so that the occurrence of overheating of the field director assembly is prevented when the same is used in an unloaded microwave oven.
1 more element
A field director assembly for use in a microwave oven, wherein the microwave oven is operative to generate a standing electromagnetic wave having a predetermined wavelength, the field director assembly comprising:
- a generally planar support member having a geometric center;
- a field director structure comprising at least six vanes each mechanically connected to the support member, each vane being substantially orthogonal with respect to the planar support member,
- at least a portion of each vane being electrically conductive, the electrically conductive portion of each vane having a first end and a second end,
- the first end of the conductive portion on each of the vanes being disposed at a distance at least a predetermined separation distance from the geometric center of the planar support member, the separation distance being at least 0.16 times the wavelength,
- the electrically conductive portion of the vane being disposed at least a predetermined close distance from the planar support member, wherein the predetermined close distance is at least 0.025 times the wavelength,
- so that the occurrence of overheating of the field director assembly is prevented when the same is used in an unloaded microwave oven.
3 more elements
Dependencies are inferred from the claim text.