Thermographic method of imaging a copy sheet

Claim 1

IN THE THERMOGRAPHIC METHOD OF IMAGING A COPY SHEET IN AREAS CORRESPONDING TO THE LOCATION OF INFRARED RADIATION-ABSORBING IMAGES ON AN ORIGINAL SHEET BY MEANS OF A TRANSFER SHEET CARRYING A LAYER OF HEAT-TRANSFERABLE IMAGING COMPOSITION, THE IMPROVEMENT WHICH COMPRISES USING A TRANSLUCENT TRANSFER SHEET WHICH DOES NT ABSORB INFRARED RADIATION TO ANY SUBSTANTIAL EXTENT COMPRISING A TRANSLUCENT FLEXIBLE PLASTIC FILM FOUNDATION SHEET HAVING ON ONE SURFACE THEREOF A HEAT-INSULATION LAYER OF PLASTIC BINDER MATERIAL HAVING A THICKNESS OF FROM ABOUT 1/4 TO ABOUT 7 POINTS AND CONTAINING FROM ABOUT 1/2 TO ABOUT 10 PARTS BY WEIGHT OF AN INFRARED RADIATION NONABSORBING FINELY DIVIDED FILLER MATERIAL PER PART OF BINDER MATERIAL AND SELECTED FROM THE GROUP CONSISTING OF SILICA, KAOLIN, CALCIUM CARBONATE, BARIUM SULFATE, TITANIUM DIOXIDE, ZINC OXIDE AND CLAY, SAID LAYER HAVING A ROUGH OUTER SURFACE, AND HAVING INTEGRATED WITH SAID ROUGH OUTER SURFACE A LAYER OF HEAT-TRANSFERABLE IMAGING COMPOSITION HAVING A THICKNESS OF FROM ABOUT 1/2 TO ABOUT 6 POINTS, WHEREBY UNDER THE EFFECTS OF HEAT GENERATED BY THE HEATED ORIGINAL IMAGES THOSE PORTIONS OF THE IMAGING LAYER INTEGRATED WITH THE ROUGH SURFACE OF THE HEAT-INSULATION LAYER REMAIN INTEGRATED THEREWITH WHILE OVERLYING PORTIONS OF THE IMAGING LAYER TRANSFER TO THE COPY SHEET IN AREAS CORRESPONDING TO THE LOCATION OF THE ORIGINAL IMAGES.