Patents by Inventor Walter Hager

Walter Hager has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Work feeding mechanism for sewing machines
    Patent number: 3970018
    Abstract: A sewing machine for sewing a material workpiece, comprises a needle holder having a sewing needle which is mounted for both pivotal movement for swinging backwardly and forwardly and vertical reciprocation. The needle is driven by a sewing machine main shaft which also drives first and second feed dogs which are independently cyclically and alternatively engageable with the material to be sewn for advancing it in timed relationship to the reciprocation and to the swinging movement of the needle.
    Type: Grant
    Filed: August 27, 1975
    Date of Patent: July 20, 1976
    Assignee: Pfaff Industriemaschinen GmbH
    Inventor: Walter Hager