Abstract: The magnetic recording layer of a recording medium contains a film-forming resin, magnetic particles, poly(ethyleneimine), and an amionic surfactant.

Abstract: An improved thermal transfer resistive ribbon usable in high resolution printing comprising a dual resistive layer formed of a first layer of low resistivity and a second layer of high resistivity, method of production thereof, use thereof and apparatus including the same.

Abstract: A printing apparatus employing a print head comprising a plurality of thin wire print electrodes mounted in a single plane and held in a closely-spaced row by an electrically insulating resilient material so that the wires are individually movable out of the planar alignment to a limited extent with respect to the other wires in the array. A relatively rigid backing member is provided to support the electrode array and the print head is mounted in a relatively fixed position relative to the print ribbon and a predetermined pressure is produced between the print head and the electrothermal print ribbon during printing operations.

Abstract: A doctor blade is used to apply a powdered toner to the depleted regions of a resistive thermal transfer ribbon. The ribbon is then moved adjacent a heating electrode that passes current through a resistive substrate of the ribbon so that a transverse line on the ribbon is heated and the added toner is fused in the depleted regions of the ribbon. The heated area of the ribbon is thereafter compressed by a cold roller to provide a uniform re-inked surface.

Abstract: Wetting by toners of the surface of reusable photoconductors in electrophotographic processes results on image cycling in adhesion of the toner to the photoconductor surface to form a film. Such filming is reduced or eliminated by including in the developer a small amount of certain unpigmented organic polymeric materials having smaller particle size than the pigmented toner particles. Suitable organic polymers are fluorinated hydrocarbon polymers and copolymers, and polyethylene.

Abstract: The present invention is concerned with a ribbon for non-impact printing. The ribbon comprises a transfer coating and a substrate which is a polycarbonate resin containing from about 15% to about 40% by weight of electrically conductive carbon black.

Abstract: The formation of toner film on the photoconductor in electrophotography is reduced by adding to the developer toner a small amount of fibrillatable polytetrafluoroethylene, and working the mixture until a random network of fibers of said polytetrafluoroethylene is formed.