Patents by Inventor Armand A. Dufault

Armand A. Dufault 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).

  • Thread control for buttonhole sewing machine
    Patent number: 4228748
    Abstract: A system for controlling the starting end of a thread is disclosed in which air is provided via a conduit and nozzle to a point adjacent the needle and above the presser foot of the sewing machine. The arrangement is such that the air is controlled by a valve whose operation is in turn controlled by the position of the presser foot so that air is supplied only when the presser foot is raised and the sewing machine is in a stopped position.
    Type: Grant
    Filed: October 29, 1979
    Date of Patent: October 21, 1980
    Inventor: Armand A. Dufault