• All sections
• F - Mechanical engineering; lighting; heating; weapons; blasting
• F04B - Positive-displacement machines for liquids; pumps
• F04B 9/111 - Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers with two mechanically connected pumping members

Patent holdings for IPC class F04B 9/111

Total number of patents in this class: 26

10-year publication summary

Principal owners for this class