 This fact coupled with other legal and technical arguments led the judge to rule, at the end of July 1912, that the holders of the original Knight patent could not be supported in their claim that it gave them master rights encompassing the Argyll design.Costs of litigation against claims by Knight patent holders seem having substantially contributed to bankrupt of Argyll in Scotland.The sleeve valve has begun to make something of a comeback, thanks to modern materials, dramatically better engineering tolerances and modern construction techniques, which produce a sleeve valve that leaks very little oil.