Career
Hinkel met electrologist Henri Saint Pierre in the 1930s while Hinkel worked at the medical division of General Electric. They began work on developing an epilator that combined electrolysis and thermolysis. In 1948, the Saint Pierre Epilator Company Incorporated., owned by Saint Pierre and Hinkel, received a patent for a blended current epilator.
Hinkel also owned a chain of electrology businesses.
He sold the manufacturing portion of the business in 1984, which still operates under the name Arkansas Hinkel.