Patents by Inventor Lars-Åke Mattsson

Lars-Åke Mattsson 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).

  • Coupling ring for ventilation ducts, and method of connecting ventilation ducts
    Patent number: 6758502
    Abstract: A flanged coupling ring for a duct element has a mounting section configured to be mounted or a connection portion of the duct element, and flange means extending outwards from the mounting section. The flange means has, along its periphery, flanged coupling portions for connecting two duct elements, each of which is provided with a coupling ring, by means of external coupling means configured to engage with the flanged coupling portions.
    Type: Grant
    Filed: January 17, 2001
    Date of Patent: July 6, 2004
    Assignee: Lindab AB
    Inventors: Lars-Åke Mattsson, Kenneth Lennartsson, Sten Högman, Carl-Gustaf Sondén
  • Apparatus and method for reshaping tubes
    Patent number: 6655182
    Abstract: In a method of reshaping a tube, an apparatus is used which has a roller nip for rotating the tube, and a shaping roller assembly for altering the cross-section of the tube, for instance from round to oval.
    Type: Grant
    Filed: May 18, 2001
    Date of Patent: December 2, 2003
    Assignee: Lindab AB
    Inventor: Lars-Åke Mattsson
  • Tubular element with sealing means and a method for manufacturing the tubular element
    Patent number: 6170883
    Abstract: A tubular element has a sealing ring mounted at an end of the tubular element. The sealing ring has a base clamped against the outer surface of the tubular element. Further, the sealing ring has a sealing lip adapted to seal against an inner surface of an outer tube, in which the tubular element is inserted. The base is disposed in a groove that is formed in the wall of the tubular element. The sealing ring has a further lip that is positioned adjacent to the end of the tubular element and that is bent down and clamped against the base by means of the end portion, thereby providing secure fastening of the sealing ring. The sealing ring is fastened by a method involving bending of the end portion of the tubular element together with the further lip.
    Type: Grant
    Filed: November 4, 1999
    Date of Patent: January 9, 2001
    Assignee: Lindab AB
    Inventors: Lars-Åke Mattssön, Pontus Andersson, Kenneth Lennartsson, Tomas Persson
  • Coupling ring for ventilation ducts
    Patent number: D453042
    Type: Grant
    Filed: January 17, 2001
    Date of Patent: January 22, 2002
    Assignee: Lindab AB
    Inventors: Lars-Åke Mattsson, Kenneth Lennartsson, Sten Högman, Carl-Gustaf Sondén
  • Coupling ring for ventilation ducts
    Patent number: D454949
    Type: Grant
    Filed: January 17, 2001
    Date of Patent: March 26, 2002
    Assignee: Lindab AB
    Inventors: Lars-Åke Mattsson, Kenneth Lennartsson, Sten Högman, Carl-Gustaf Sondén
  • Coupling ring for ventilation ducts
    Patent number: D456071
    Type: Grant
    Filed: January 17, 2001
    Date of Patent: April 23, 2002
    Assignee: Lindab AB
    Inventors: Lars-Åke Mattsson, Kenneth Lennartsson, Sten Högman, Carl-Gustaf Sondén
  • Coupling ring for ventilation ducts
    Patent number: D456072
    Type: Grant
    Filed: January 17, 2001
    Date of Patent: April 23, 2002
    Assignee: Lindab AB
    Inventors: Lars-Åke Mattsson, Kenneth Lennartsson, Sten Högman, Carl-Gustaf Sondén
  • Coupling ring for ventilation ducts
    Patent number: D461887
    Type: Grant
    Filed: January 17, 2001
    Date of Patent: August 20, 2002
    Assignee: Lindab AB
    Inventors: Lars-Åke Mattsson, Kenneth Lennartsson, Sten Högman, Carl-Gustaf Sondén
  • Coupling ring for ventilation ducts
    Patent number: D475781
    Type: Grant
    Filed: December 13, 2001
    Date of Patent: June 10, 2003
    Assignee: Lindab AB
    Inventors: Lars-Åke Mattsson, Kenneth Lennartsson, Sten Högman, Carl-Gustaf Sondén