Patents by Inventor Peter Ekelund

Peter Ekelund 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).

  • Flexible sheet or web materials
    Patent number: 4896901
    Abstract: A document security article is disclosed in which a light polarizing element is contained within a flexible sheet element. A region of the light polarizing element is exposed at a window at both faces of the sheet element and optionally at a further window at one face of the sheet element. Folding the article to align the windows produces cross polarization between the exposed regions of the light polarizing element.
    Type: Grant
    Filed: May 6, 1988
    Date of Patent: January 30, 1990
    Assignee: Svecia Antiqua S.A.
    Inventor: Peter Ekelund