having pawl-and-ratchet type drive

Patents Grantslast 30 patents

  • Information Patent Grant

    3544241

    • Patent number 3,544,241
    • Issue date Dec 1, 1970
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Grant

    2222706

    • Patent number 2,222,706
    • Issue date Nov 26, 1940
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Grant

    1739661

    • Patent number 1,739,661
    • Issue date Dec 17, 1929
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...