Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1997-05-05
1999-03-23
Paschall, Mark H.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219541, 219536, 338 22R, 29611, H05B 102
Patent
active
058863249
ABSTRACT:
A novel current limiting PTC polymer device and methods of making the same comprising a current limiting polymer composition with porous electrodes interfaced therewith such that a low contact resistance results using a combination of (1) extrusion attachment of the current limiting polymer composition to the porous electrodes, (2) careful selection of the electrode materials in view of the conductive filler and/or conductive metal particles in the current limiting polymer composition, and (3) plasma treatment of the attachment surfaces of the current limiting polymer composition preceding and/or during the extrusion attachment process. The invention provides for the selective treatment of portions of the surface of the current limiting polymer composition by at least one of plasma etching and metallizing to create attachment surfaces for extrusion attachment of porous electrodes resulting in a low contact resistance, mechanical stability and a reduced potential for arcing in the electrode/polymer interface. The electrical devices of the invention are particularly useful in circuit protection applications.
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Eaton Corporation
Moran Martin J.
Paschall Mark H.
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