 Subsequent major developments, especially in the US, benefited from expertise gained in the production of uranium hexafluoride.Starting in the late 1940s, a series of electrophilic fluorinating methodologies were introduced, beginning with CoF3.Electrochemical fluorination ("electrofluorination") was announced, which Joseph H. Simons had developed in the 1930s to generate highly stable perfluorinated materials compatible with uranium hexafluoride.