Patents by Inventor Lee R. Ewert

Lee R. Ewert 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).

  • Springback stretch press
    Patent number: 4989439
    Abstract: A device and method for taking to account the elasticity of materials during bending operations to cause the proper amount of overbending such that after springback and while at rest, the material assumes its intended shape.
    Type: Grant
    Filed: November 17, 1988
    Date of Patent: February 5, 1991
    Assignee: McDonnell Douglas Corporation
    Inventors: Lee R. Ewert, Sumner B. Sargent, Walter Leodolter