Patents by Inventor Per-Ake Lofgren

Per-Ake Lofgren 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).

  • Radar camouflage material
    Patent number: 5225454
    Abstract: In the manufacture of PVC cellular plastic, a liquid plastic mixture is admixed with fibres in an amount of at most 0.050 percent by weight fibres, preferably carbon fibres having a length of about 1 cm, which fibres are distributed in the expanded cellular plastic isotropically with respect to both position and alignment. The cellular plastic is effective to dampen electromagnetic radiation within the radar range to at least 1-3 dB per cm.
    Type: Grant
    Filed: June 4, 1992
    Date of Patent: July 6, 1993
    Assignee: Barracuda Technologies, AB
    Inventor: Per-ake Lofgren
  • Camouflage covering
    Patent number: 5153045
    Abstract: A camouflage covering intended for affixing to military objects, particularly heated surfaces of tanks. It consists of layers held together by means of neelding and comprises a super-absorbent fibers, so that it can be kept cool by evaporating water previously applied. By including fibers, it may have radar camouflage properties. A substantial pile obtained by needling will give a non-reflecting surface.
    Type: Grant
    Filed: April 17, 1990
    Date of Patent: October 6, 1992
    Assignee: Diab-Barracuda AB
    Inventor: Per-Ake Lofgren