Patents Assigned to IFM Akustikbyran AB
  • Structural damping
    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
  • Hygienic absorbent and use of a plastic foil in the absorbent
    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
  • Road surfacing and method for manufacturing such road surfacing
    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