Patents by Inventor Bjorn M. H. Engstrom

Bjorn M. H. 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).

  • Collapse preventing connection device for building structures
    Patent number: 4630412
    Abstract: A connection device for building structures preventing progressive collapse. A pull means (1) incorporated in the device is adapted to be connected to a part of the structure by means of a cast compound that allows controlled slippage of the pull means at a tensile stress in the pull means which is below its ultimate tensile strength. The pull means is provided with an anchoring means (2) which after abutment against a stop means (3) stops slippage after a predetermined distance.
    Type: Grant
    Filed: January 30, 1985
    Date of Patent: December 23, 1986
    Inventors: Bjorn M. H. Engstrom, Karl-Gustav Bernander