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US 4,717,814 AGranted
Slotted autoregulating heater
AssigneeMetcal, Inc.
InventorJohn F. Krumme
Life of this patent
Estimating the term…
Abstract
Designation of specific heating zones and increase in minimum resistance relative to prior heaters of the type to which the present invention pertains is achieved, together with flexibility or bendability, if desired, by slotting the outer conductor of the heater. Additional flexibility is also achieved by confining the high mu material only to those regions of the device where heating is desired, the unslotted regions.
Claims15
A Curie temperature autoregulating heater comprising an outer conductor having a plurality of surfaces
- and at least one slot in a specified region of at least one of said surfaces, which slot is less in length than said surfaces and is positioned to interrupt current flow through at least a length of said outer conductor,
- ferromagnetic material disposed adjacent and in electrical and thermal contact with a surface of said outer conductor other than said region in said one of said surfaces,
- a return conduductor electrically connected in series with said ferromagnetic material.
Dependencies are inferred from the claim text.