Patents by Inventor Graham R. Dawson

Graham R. Dawson 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).

  • Method and apparatus for forming material by forcing through a die orifice
    Patent number: 4072034
    Abstract: Method and apparatus for deforming the section of material by forcing it, e.g. punching or drawing it, through a die. The die, die holder and workpiece are vibrated in tune, e.g. acoustically, so that points on the walls of the die orifice oscillate in a direction lying generally radial to the die axis. This causes the die to exert a swaging action upon the material and contribute to the deformation thus reducing the power needs for forcing the workpiece through the die and increasing the maximum deformation obtainable.
    Type: Grant
    Filed: July 24, 1975
    Date of Patent: February 7, 1978
    Assignee: National Research Development Corporation
    Inventors: Graham R. Dawson, Dennis H. Sansome