• All sections
• F - Mechanical engineering; lighting; heating; weapons; blasting
• F01L - Cyclically operating valves for machines or engines
• F01L 1/344 - Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear

Patent holdings for IPC class F01L 1/344

Total number of patents in this class: 1709

10-year publication summary

Principal owners for this class