Adam and Theodore Emig, of Sheridan, Illinois, registered a Patent for their Hair Invigorator in 1878 (Patent #209,335). They assigned half of their rights at that time to Philip Rodenheber and John Carey, of Chicago. The preparation was made by crushing or grinding about 1/2 bushel of white oak bark, soaking it in seven gallons of kerosene oil for about 6 weeks. After the time has elapsed, the oil is drawn off and strained, and a suitable perfume is added. They claimed that the preparation invigorates and promotes the growth of the hair of the head.