Patents by Inventor Mats E. Bjorkland

Mats E. Bjorkland 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).

  • Patent number: 4255380
    Abstract: A sign is fabricated which presents different messages depending on the angle of view. The fabricated sign has walls, different sides having parts of different messages. The method of fabrication includes taking at least two images, cutting them into strips of equal width and combining successive strips alternatively from the two images in order to form a third image, which is printed on a plastic sheet. This sheet is laid upon a wave-formed mold surface so that the tops of the waves coincide with the borders between the strips. The plastic sheet is softened and stretch-deformed, e.g., by vacuum deformation, while the borders are held against movement into the form of the waved mold surface.
    Type: Grant
    Filed: February 8, 1979
    Date of Patent: March 10, 1981
    Inventor: Mats E. Bjorkland