Abstract: A printing ink comprises particles of small size, each having a body portion consisting of a fusible resin and a colorant and electrically conductive material situated substantially entirely on the surface of the body portion. The particles may be formed by a variety of methods. The body portion may have a magnetizable constituent for use in printers with magnetic ink orientation. The particles may be formed by spray drying to produce hollow beads.

Abstract: A printing ink comprises particles of small size, each having a body portion consisting of a fusible resin and a colorant and electrically conductive material situated substantially entirely on the surface of the body portion. The particles may be formed by a variety of methods. The body portion may have a magnetizable constituent for use in printers with magnetic ink orientation. The particles may be formed by spray drying to produce hollow beads.

Abstract: Structures for supporting printing articles in spaced aggregates as mounds and towers, for use in pulsed electrical printers, and method for their production. The structures comprise a base sheet having a roughened or microcavernous surface to receive the printing particles. The base sheet may be formed of or coated with conductive material, and may comprise a magnetizable material useful in forming and retaining the aggregates.

Abstract: Structures for supporting printing particles in spaced aggregates as mounds and towers, for use in pulsed electrical printers, and method for their production. The structures comprise a base sheet having a roughened or microcavernous surface to receive the printing particles. The base sheet may be formed of or coated with conductive material, and may comprise a magnetizable material useful in forming and retaining the aggregates.

Abstract: A non-impact printer having a support for magnetic ink particles loosely distributed on its surface in mutually spaced aggregates of irregular height. An electrical field of short duration, established in a print position between the particles and a shaped print electrode, charges the particles and attracts them to an intervening recipient sheet. The printed image is rendered more uniform by magnetic reorientation of the aggregates of greater height before printing, in a field having components normal to the electrical field in the region of the print position.

Abstract: A non-impact printer having a moving support for supplying particles of magnetic ink. The ink particles are deposited upon the support and subjected to a magnetic field to produce a bead of the particles that rotates as the support moves toward a print position. A number of the particles detach from the bead and remain on the support as mutually spaced aggregates of irregular height. An electrical field of short duration, established in the print position between the particles and a shaped print electrode, charges the particles and attracts them to an intervening recipient sheet.

Abstract: A non-impact printer for transferring printing particles from a donor sheet to a recipient sheet by applying pulses to produce an electrical field between a print electrode and a base electrode. The print electrode comprises a conductive member having a field shaping surface corresponding in shape to an image to be printed. The electric field passes through dielectric material between the field shaping surface and the donor and recipient sheets, the dielectric material being chosen for its stability against breakdown in high electric fields.