Selective printing using electrostatic techniques

Claim 1

IN AN ELECTROSTATIC PRINTING SYSTEM OF THE TYPE WHEREIN AN ARTICLE TO BE PRINTED ON WITH AN ELECTROSCOPIC PIGMENT POWDER IS POSITIONED IN AN ELECTRIC FIELD ONE OF THE ELECTRODES OF WHICH IS A CONDUCTIVE APERTURED SCREEN HAVING THE SHAPE OF A CHARACTER DESIRED TO BE PRINTED, THE IMPROVEMENT COMPRISING A MOVABLE CONTAINER HAVING SAID CONDUCTIVE APERTURED SCREEN MOUNTED IN AN OPERATING FACE THEREOF, SAID PIGMENT POWDER BEING IN SAID CONTAINER AND HAVING A PARTICLE SIZE SMALLER THAN THE OPENINGS OF SAID SCREEN, CARRIER PARTICLES IN SAID CONTAINER MIXED WITH SAID PIGMENT POWDER AND HAVING A PARTICLE SIZE LARGE THAN THE OPENINGS OF SAID SCREEN, MEANS FOR MOVING SAID CONTAINER WITH SAID APERTURED SCREEN FROM A POSITION AWAY FROM SAID ARTICLE TOWARD SAID ARTICLE WHEN IT IS DESIRED TO PRINT, AND MEANS FOR ABRUPTLY TERMINATING THE MOTION OF SAID CONTAINER AT THE DESIRED POSITION FOR PRINTING.