Storage tube with secondary emissive storage grid

Claim 1

A DIRECT-VIEW DISPLAY STORAGE TUBE COMPRISING: (A) A SCREEN ADAPTED TO LUMINESCE IN RESPONSE TO ELECTRON IMPINGEMENT THEREON, (B) A STORAGE GRID SPACED FROM SAID SCREEN, (C) MEANS FOR CHARGING SAID GRID BY SECONDARY ELECTRON EMISSION TO PROVIDE A PREDETERMINED STORED ELECTROSTATIC CHARGE PATTERN THEREON, (D) MEANS FOR PROVIDING A PERSISTENT VISIBLE DISPLAY ON SAID SCREEN CONFORMING TO SAID CHARGE PATTERN, (E) SAID GRID COMPRISING A CONDUCTIVE MESH HAVING THEREON A STORAGE BODY COMPRISING A FIRST LAYER OF CADMINUM SULFIDE AND A SECOND LAYER OF ZINC SULFIDE, (1) SAID STORAGE BODY HAVING SECONDARY EMISSION AND BOMBARDMENT-INDUCED CONDUCTIVITY CHARACTERISTICS WHEREBY LOSS OF ELECTRONS FROM SAID STORAGE BODY BY SECONDARY EMISSION IS COMPENSATED FOR BY ELECTRONS SUPPLIED BY THE BOMBARDMENT-INDUCED CONDUCTIVITY OF SAID STORAGE BODY IN RESPONSE TO A BEAM OF ELECTRONS HAVING A PREDETERMINED ENERGY LEVEL ABOVE THE ENERGY LEVEL OF SAID PERSISTENT DISPLAY-PRODUCING MEANS, (F) MEANS FOR PRODUCING A B EAM OF ELECTRONS HAVING SAID PREDETERMINED ENERGY LEVEL, (G) MEANS FOR SCANNING SAID BEAM OF ELECTRONS ACROSS SAID STORAGE BODY AND ACROSS THE OPENINGS IN SAID MESH, WHEREBY THE PORTION OF SAID BEAM PASSING THROUGH SAID OPENINGS IMPINGES ON SAID SCREEN TO PROVIDE THEREON A VISIBLE DISPLAY THAT IS DIFFERENT FROM SAID PERSISTENT VISIBLE DISPLAY, AND THE PREVIOUSLY FORMED CHARGE PATTERN ON SAID STORAGE BODY IS PRESERVED.