Abstract: A corona charge device which can charge a medium being charged such as a photoconductive body or a record sheet provided for a conventional electrographic apparatus. The device comprises a corona discharge wire connected to a high voltage source and a grounded shield electrode surrounding the corona discharge wire and composed of an elongate rectangular closed vessel which is open at its bottom wall to define an opening. The transverse width of the opening is reduced by two opposed elongate insulating plates secured to the side walls of the vessel.

Abstract: An A.C. corona discharging device for use in the process in which discharge and exposure are accomplished contemporaneously has insulating members disposed so as to surround the discharge wire or electrode and define the opening for projecting the image of an original. The potential gradient is increased, the discharge efficiency is improved and the flow of useless current which heretofore traveled through the shielding electrode is not encountered.

Abstract: A device to discharge substrates loaded with static electricity by means of an electric glow discharge generated between isolated high voltage electrodes and exposed needle electrodes connected to a grounded collector bar is characterized by the fact that the high voltage electrodes are formed as concentric closed rings conductively connected to each other and disposed in spaced coaxial relationship with the needle electrodes. The grounded collector bar is formed as a hollow chamber into which compressed air may be introduced and directed into the space between the ring electrodes and the needle electrodes associated therewith to perform a cleaning operation and aid in directing ions toward the substrate to be discharged.

Abstract: AC electrostatic-pinning for the casting and quenching of polymeric film, especially polyethylene terephthalate film.

Abstract: In an electrostatic coating system in which material is sprayed onto a workpiece under the influence of an electrostatic field, any electrostatic charge supplied to the workpiece is removed by a discharging device maintained out of contact with the workpiece and disposed so that its effective range is outside the material spray region.

Abstract: A corona and associated electrical drive as shown herein, neutralize the static charges on non-conductive sheets or webs. The neutralization of static charge is accomplished by passing the material to be neutralized under a double wire corona. Both wires in the corona are connected to an AC signal. The AC signal drives both wires with a signal that alternates in polarity at frequency f. The wires are spaced apart a predetermined distance calculated from a function dependent upon the frequency of the AC signal and the speed of the paper moving under the corona wires. The predetermined distance is such that a given area of the paper will pass under one wire at a first polarity and under the second wire at the opposite polarity. Further enhancement of neutralization can be accomplished by using a second double wire corona out of phase with the first double wire corona.

Abstract: A method of and apparatus for removing electrostatic charges from an insulating foil by moving the foil between first and second gas plasma generators including a novel arrangement of electrodes that produce uniform glow discharges in air adjacent the electrodes and the foil.