• All sections
• F - Mechanical engineering; lighting; heating; weapons; blasting
• F01L - Cyclically operating valves for machines or engines
• F01L 9/12 - Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic in which the action of a cam is being transmitted to a valve by a liquid column with a liquid chamber between a piston actuated by a cam and a piston acting on a valve stem

Patent holdings for IPC class F01L 9/12

Total number of patents in this class: 10

10-year publication summary

Principal owners for this class