Patents by Inventor Gunnar I. Hagbjer

Gunnar I. Hagbjer 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).

  • Sandwich structures with partial damping layers
    Patent number: 4195713
    Abstract: According to the invention the damping of vibration on the part of a structural material such as metal or concrete is effected by applying a limited amount of vibration-damping viscoelastic material between the two such structural parts, the vibration-damping material being being applied in lines, points or the like spaced from each other at distances less than one bending wavelength for the highest frequency range to be damped.
    Type: Grant
    Filed: September 18, 1978
    Date of Patent: April 1, 1980
    Assignee: Reduc Acoustics AB
    Inventors: Gunnar I. Hagbjer, Odd B. Sylwan
  • Assembly for applying thin damping layers in building structures
    Patent number: 3956563
    Abstract: A noise-, and vibration-, damping article for use in a building structure is a laminated composite consisting essentially of a backing strip which on each of its two sides is provided with a damping layer comprising a viscoelastic material. At least one of said damping layers includes a granular material receptive to bonding with a material of the building structure.
    Type: Grant
    Filed: August 7, 1973
    Date of Patent: May 11, 1976
    Assignee: Akustikbyran AB
    Inventors: Kjell K. I. Spang, Gunnar I. Hagbjer, Jan Werner, Goran R. Gadefelt, Bo M. S. Egerborg