Electroluminescent device

Claim 1

AN ELECTROLUMINESCENT CELL COMPRISING, A GLASS FOUNDATION HAVING A VIEWING FACED AND EDGE PORTIONS, A LIGHTTRANSMITTING FIRST ELECTRODE CARRIED ON SAID GLASS FOUNDATION, A SECOND METALLIC ELECTRODE SPACED FROM SAID FIRST ELECTRODE, SAID SECOND ELECTRODE HAVING SUFFICIENT STRUCTURAL CONTINUITY TO DISPLAY ELECTRICAL CONTINUITY THROUGH ANY PORTION THEREOF BUT ALSO HAVING SUCH DISCONTINUITY OF STRUCTURE AS TO PERMIT INGRESS OF LIQUID, A LAYER COMPRISING ELECTROLUMINESCENT PHOSPHOR INCLUDED BETWEEN SAID SPACED ELECTRODES, SAID SPACED ELECTRODES AND SAID LAYER COMPRISING ELECTROLUMINESCENT PHOSPHOR FORMING THE OPERATIVE PORTION OF SAID CELL, AN ADDITIONAL LAYER OF MATERIAL OVER AND ADHERENT TO SAID SECOND ELECTRODE AND EXTERIOR TO THE OPERATIVE PORTION OF SAID CELL, SAID ADDITIONAL LAYER OF MATERIAL HAVING SUCH STRUCTURAL CONTINUITY AS TO BE IMPERVIOUS TO PASSAGE OF LIQUID THERETHROUGH, DISCONTINUITIES IN SAID SECOND ELECTRODE REMAINING SUBSTANTIALLY UNCONTAMINATED WITH ANY MATERIAL COMPRISING SAID ADDITIONAL LAYER, A LAYER AT LEAST PRINCIPALLY COMPRISING MOISTUREIMPERVIOUS EPOXY RESIN OVER AND ADHERENT TO SAID ADDITIONAL LAYER OF MATERIAL AND EXTENDING AT LEAST ONTO THE EDGE PORTIONS OF SAID GLASS FOUNDATION, AND MEANS FOR CONNECTING SAID ELECTRODES ACROSS A SOURCE OF ELECTRICAL POTENTIAL.