Surfaces for collectors of solar radiation

Claim 1

A SOLAR HEATER COMPRISING A RECEIVER CONSTITUTEDD BY A THIN FLEXIBLE METALLIC FOIL AND MEANS DEFINING A SURFACE COATING ON SAID FOIL IN FACE TO FACE HEAT CONDUCTING RELATION THEREWITH, THE RECEIVER BEING FLEXIBLE AND ADAPTED FOR BEING WOUND IN A ROLL, SAID HEATER FURTGHER COMPRISING A HEAT TRANSFER BODY, AND ADHESIVE MEANS JOINING THE RECEIVER IN HEAT CONDUCTING RELATIONSHIP TO THE HEAT TRANSFER BODY, SAID SURFACE COATING BEING LIGHT ABSORPTIVE, HEAT TRANSPARENT AND NON RADIANT OF HEAT TO CONFER A SUBSTANTIALLY LOW HEAT EMISSIVITY FOR SAID RECEIVER IN ORDER THAT IMPINGING LIGHT ENERGY IS ABSORBED IN SAID COATING AND IS TRANFERRED IN THE FORM OF HEAT TO SAID FOIL WITH COMPARATIVELY SMALL LOSSES OF HEAT BY RE-RADIATION FROM SAID FOIL, SAID FOIL, BY VIRTUE OF THE HEAT CONDUCTING RELATION ESTABLISHED WITH THE BODY BEING OPERATIVE TO TRANSFER HEAT TO SAID HEAT TRANSFER BODY WHEREAT ACCUMULATION OF HEAT MAY BE EFFECTED WHILE SAID RECEIVER PREVENTS EMISSION OF HEAT FROM SAID BODY.