william dubilier, whose first patent for electrolytic capacitors was filed in 1928, industrialized the new ideas for electrolytic capacitors and started the first large commercial production in 1931 in the cornell-dubilier (cd) factory in plainfield, new jersey. at the same time in berlin, germany, the "hydra-werke", an aeg company, started the production of e-caps in large quantities. another manufacturer, ralph d. mershon, had success in servicing the radio-market demand for electrolytic capacitors.