[1] After the death of the liberal minister for building, Hermann-Eberhard Wildermuth, in 1952, Neumayer led the ministry until the 1953 West German federal election.

[1] He furthered judicial gender equality with a law of early 1954, though "according to the natural order"[nb 1] granting a husband the right to issue binding decisions for his spouse if the wellbeing of the family was not endangered.

[4][5] In Neumayer's words, the law was to "rule off crimes committed directly or collaterally in the context of the conditions of a chaotic time period".

[nb 2] Amnestied were people convicted of crimes up to manslaughter, but not murder, committed between 1 October 1944 and 31 July 1945 in the assumption of a legitimacy of their action, especially by following orders,[6] or out of an emergency.

[7][8] In 1956, Neumayer together with all other liberal federal ministers left the FDP to join the newly founded Freie Volkspartei (FVP).