Patents Assigned to Akustikbyran AB
  • Patent number: 4527371
    Abstract: For improved vibration damping are used preferably a plurality of parallel bodies (30) of generally thread-like configuration which are embedded in a layer of adherent viscoelastic material (29) applied to a vibrating structure or to a body (24) which in turn rests against a vibrating structure (22).
    Type: Grant
    Filed: February 14, 1983
    Date of Patent: July 9, 1985
    Assignee: IFM-Akustikbyran AB
    Inventor: Gunnar Hagbjer
  • Patent number: 4450195
    Abstract: A hygienic absorbent, i.e. a substantially liquid and gas tight sound absorbent, including an under-absorbent (11), a tight foil (13) and gas-filled blisters (15) located therebetween. Preferably a supporting layer (16) is located outside the under-absorbent to support the blisters (15).
    Type: Grant
    Filed: December 31, 1980
    Date of Patent: May 22, 1984
    Assignee: IFM Akustikbyran AB
    Inventor: Gunnar Hagbjer
  • Patent number: 4396312
    Abstract: A road surfacing (3) which emits reduced rolling noise and a method for the manufacture of such a road surfacing is disclosed. The road surfacing material is relatively soft and incorporates air-permeable, preferably intercommunicating channels or pores. In the manufacture of the surfacing, granulate or chip particles (4) are bound so that channels or pores are formed between the particles.
    Type: Grant
    Filed: January 9, 1981
    Date of Patent: August 2, 1983
    Assignee: IFM Akustikbyran AB
    Inventor: Nils-Ake Nilsson
  • 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