 It is reported that litigation by the owners of the Knight patents cost Argyll £50,000, perhaps one of the reasons for the temporary shutdown of their plant.Another car maker that used the Argyll SSV patents, and others of their own (patent GB118407), was Piccard-Pictet (Pic-Pic); Louis Chevrolet and others founded Frontenac Motors in 1923 with the aim of producing an 8-L SSV engined luxury car, but this never reached production for reasons connected to the time limits to the Argyll patents in the USA.The greatest success for single sleeve valves (SSV) was in Bristol's large aircraft engines, it was also used in the Napier Sabre and Rolls-Royce Eagle engines.