After his death in 1715 Savery's patent and Act of Parliament became vested in a company, The Proprietors of the Invention for Raising Water by Fire.[7] This company issued licences to others for the building and operation of Newcomen engines, charging as much as £420 per year patent royalties for the construction of steam engines.[8] In one case a colliery paid the Proprietors £200 per year and half their net profits "in return for their services in keeping the engine going".[9]