• All sections
• F - Mechanical engineering; lighting; heating; weapons; blasting
• F04C - Rotary-piston, or oscillating-piston, positive-displacement machines for liquids; rotary-piston, or oscillating-piston, positive-displacement pumps
• F04C 2/344 - Rotary-piston machines or pumps having the characteristics covered by two or more of groups , , , or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group or and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member

Patent holdings for IPC class F04C 2/344

Total number of patents in this class: 778

10-year publication summary

Principal owners for this class