Editing Sleeve valve (section)

===The Knight-Argyll Patent Case===
When the Argyll car was launched in 1911, the Knight and Kilbourne Company immediately brought a case against Argyll for infringement of their original 1905 patent. This patent described an engine with a single moving sleeve, whereas the Daimler engines being built at the time were based on the 1908 Knight patent which had engines with two moving sleeves. As part of the litigation an engine was built according to the 1905 specification and developed no more than a fraction of the rated [[Horsepower#RAC horsepower (taxable horsepower)|RAC horsepower]]. This fact coupled with other legal and technical arguments<ref>"The Knight-Argll Patent Case", The Automotor Journal, 3 August 1912, pp919-920</ref> 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.