Patents by Inventor Egon Swedberg

Egon Swedberg 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).

  • Stretcher frame with manually rotatable corner stretching elements
    Patent number: 4829685
    Abstract: A stretcher frame comprises a plurality of frame parts which face one another at their corner surfaces. A rotary stretching element has portions thereof extending into both recesses of opposing corner surfaces to prevent relative movement between the parts in a direction parallel to an axis of rotation of the stretching element. The stretching element includes a first bearing surface bearing against a wall of one frame part, and a second bearing surface bearing against a wall of the other frame part. The second bearing surface is non-symmetrical relative to the axis of rotation whereby the frame parts are spread apart in response to rotation of the stretching element.
    Type: Grant
    Filed: January 28, 1988
    Date of Patent: May 16, 1989
    Inventors: Gosta Persson, Egon Swedberg