SELECTIVE SHIELDING FOR PORTABLE HEATING APPLICATIONS
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United States of America Patent
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Issued Date -
Oct 2, 2014
app pub date -
Dec 6, 2012
filing date -
Dec 6, 2011
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Abstract
A wireless power supply and a portable heating device are provided. The wireless power supply includes an electromagnetic shield and the portable heating device includes a magnetic field source. Placement of the magnetic field source proximate the electromagnetic shield can create a local flux window in the electromagnetic shield. The transfer of electromagnetic flux through the local flux window energizes the portable heating device at various locations along the wireless power supply. The effectiveness of the electromagnetic shield is generally maintained away from the flux window, and the electromagnetic shield reduces stray flux that might otherwise damage nearby objects and/or reduce the efficiency of the wireless power supply.
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