. "Patent US4298672 - Electrography - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More ??Sign inAdvanced Patent SearchPatentsDisclosed is a positively charged developer comprised of a toner and an alkyl pyridinium compound and its hydrate of the formula ##STR1## wherein A is an anion selected from halides such as chlorine, bromine, iodine, sulfate, sulfonate, nitrate and borate, an" . . .