Patents by Inventor Carl-Otto Engstrom

Carl-Otto Engstrom 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: 5016374
    Abstract: The present invention relates to a device for receiving essentially planar products, preferably graphic products, which includes two or several frames. Each frame can receive two such products and is formed by four frame members with a longitudinal first flange and a second flange located at one longitudinal narrow side of the first flange. A product inserted into the frame engages the first flanges of the four frame members with its one side and abuts the other flanges with its side edges. The frames are sidewardly hingedly interconnected by means of band-shaped hinges, these band-shaped hinges being designed with two ends and provided with a resilient folding or bending at each end, which is arranged to be received and/or restrained between two opposing walls defining a space in a respective frame member.
    Type: Grant
    Filed: September 13, 1989
    Date of Patent: May 21, 1991
    Assignee: Ahlberg & Co. AB
    Inventor: Carl-Otto Engstrom