American chemist and engineer, Hamilton Castner, solved the mixing problem with the invention of the mercury cell and was granted a U.S. patent in 1894. Austrian chemist, Carl Kellner arrived at a similar solution at about the same time.
American chemist and engineer Hamilton Castner resolved the mixing issue using the mercury cell and received a U.S. patent in 1894. Simultaneously, Austrian chemist Carl Kellner developed a similar approach to solving this problem.