US 4,250,398 AGranted

Solid state electrically conductive laminate

AssigneeDelphic Research Laboratories, Inc.

InventorsHarold Ellis, Alexander De Fonso, Stephen Rosa

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Abstract

A unitary, composite laminated article comprises an electrically insulating top layer and an electrically insulating bottom layer. Applied to the inner surfaces of each of these layers is a barrier layer substantially impermeable to moisture and water vapor. A substantially continuous electrically conductive layer of substantially uniform thickness is interposed between the barrier layers. The electrically conductive layer is comprised mainly of carbon and is capable of emitting electromagnetic radiation when an electric current is passed therethrough. In contact with the electrically conductive layer is electrical conductor means. The top layer and bottom layer are sealed together to thereby form an enclosed laminate. The electrically conductive layer exhibits very stable resistivity. The use of the article as a radiant heating device and a method for its manufacture are provided. The device is especially useful for personal comfort heating and as a heat source in commercial, residential and industrial establishments.

Claims17

Dependent claims

A unitary, composite, laminated article of manufacture comprising:

(A) an electrically insulating top layer having an inner surface and an outer surface;
(B) a first barrier layer of polymeric material having a water vapor transmission rate (ASTME 96) not exceeding about 0.5 g/100 sq.in./24 hr/mil at 37.8.degree. C., wherein said first barrier layer substantially covers said inner surface of said top layer;
(C) an electrically insulating bottom layer having an inner surface and outer surface;
(D) a second barrier layer of polymeric material having a water vapor transmission rate (ASTME 96) not exceeding about 0.5 g/100 sq.in./24 hr/mil at 37.8.degree. C., wherein said second barrier layer substantially covers said inner surface of said bottom layer;
(E) a substantially continuous, electrically conductive layer of substantially uniform thickness between said first and second barrier layers, wherein said electrically conductive layer is comprised mainly of carbon and is capable of emitting electromagnetic radiation when an electric current is passed therethrough;
(F) electrical conductor means in contact with said electrically conductive layer;
wherein said top layer and said bottom layer have edges, which are sealed together to thereby form an enclosed laminate containing an electrically conductive layer having stable resistivity.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 05/883,008Filed 3 Mar 1978
Granted: 10 Feb 1981
Term ends: Not estimatedThe source records don’t support an estimate.

Classification26 codes

B32B 9/007
Comprising one layer of ceramic material, e.g. porcelain, ceramic tile: comprising carbon, e.g. graphite, composite carbon
B32B 7/025
Physical, chemical or physicochemical properties: electric or magnetic properties
B32B 7/12
Interconnection of layers: using interposed adhesives or interposed materials with bonding properties
B32B 9/045
Comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different…