Electric heating – Heating devices – With heater-unit housing – casing – or support means
Patent
1987-05-20
1988-10-11
Griffin, Donald A.
Electric heating
Heating devices
With heater-unit housing, casing, or support means
219541, H05B 334, H05B 308
Patent
active
047773510
ABSTRACT:
A number of improvements to electrical devices, particularly sheet heaters, comprising conductive polymer compositions, are provided. The preferred heater has the following features (a) it comprises a laminar resistive element and a plurality of electrodes which are so positioned that the predominant direction of current flow is parallel to the faces of the laminar element, (b) it comprises a laminar insulating element adjacent to but not secured to the electrodes and the resistive element; (c) it comprises a metallic foil, which acts as a ground plane and is positioned adjacent the insulating element but is not secured thereto; (d) it comprises a dielectric layer intimately bonded to the resistive element and to the electrodes.
The invention also provides an electrical device comprising first and second members having different resistivities, and a thin contact layer of intermediate resistivity positioned between the first and second members.
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Batliwalla Neville S.
Jones Michael C.
Oswal Ravinder K.
Shafe Jeff
Trammell Bernadette A.
Burkard Herbert G.
Gerstner Marguerite E.
Griffin Donald A.
Raychem Corporation
Richardson Timothy H. P.
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