Heater assembly

Electric heating – Heating devices – Combined with container – enclosure – or support for material...

Patent

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Details

219345, 219386, 219544, 219548, 338254, H05B 368

Patent

active

042861438

ABSTRACT:
Laminated heater plate assembly is formed from a plurality of layers of glass cloth and/or glass mat and epoxy resin which are laminated together under heat and pressure. One or more thermally conductive heater members are mounted in a cut-out region(s) in a pre-cured or "C" stage laminate top portion of the assembly while a plurality of uncured or "B" stage glass mat and epoxy resin laminations are stacked, assembled under the "C" stage portion and heater portion(s), and bonded to each other into a rigid, warp-free heater plate assembly which can be repeatedly subjected to steam or hot water without damage. Preferably, the resin density after bonding in the region of the edges of the heater portion(s) and the adjacent surrounding edges of the cut-out region(s) is greater than in locations spaced further from the heater portion(s) in order to enhance the sealing of the assembly in the most critical areas thereof. In a preferred embodiment the weight of the assembly is reduced by the use of micro-balloons in some laminations, the absence of epoxy in others, and by the elimination of portions of the interior layers.

REFERENCES:
patent: 2152126 (1939-03-01), Young
patent: 2640906 (1953-06-01), Haynes
patent: 2643320 (1953-06-01), Pfenninger, Jr.
patent: 2843711 (1958-07-01), Crick
patent: 2952761 (1960-09-01), Smith-Johannsen
patent: 2961524 (1960-11-01), Newman
patent: 3218436 (1965-11-01), Edwards et al.
patent: 3436816 (1969-04-01), Lemelson

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