From ACE to ACENO: How America's Munson added Harley's British mixture to nitrous oxide.

An Ohio dentist, Corydon Munson, patented a gasometer with an attachment for vaporizing trace amounts of volatile general anesthetics or their mixtures into unoxygenated nitrous oxide. After vaporizing a variant of George Harley's ACE mixture into nitrous oxide, Munson branded his own novel anesthetic combination as ACENO.