Herbert Manfred “Zeppo” Marx the youngest of, and last survivor of, the five Marx Brothers, was comedic actor, appearing in the first five Marx Brothers movies. He was also an inventor. On March 18, 1952, Zeppo received U.S. Patent No. 2,590,026 on a Vapor Delivery Pad for Distributing Moist Heat:

This was not his only invention — we previously blogged about his heart-monitoring watch.