A method and device for improving the printing performance of electrographic printers, in which a latent electrical charge pattern of electric signals is produced by an electrode matrix or the like, which temporarily produces electrical fields for attraction of pigment particles toward an information...http://www.google.com.au/patents/US5446478?utm_source=gb-gplus-sharePatent US5446478 - Method and device for cleaning an electrode matrix of an electrographic printer
