Patents by Inventor Hans-Gunnar Qvist

Hans-Gunnar Qvist 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).

  • Heat exchanger for EGR-gas
    Patent number: 8136578
    Abstract: A heat exchanger for a first and a second medium flow includes flat tubes which have internal fins formed from zigzag-shaped sheet metal plate. The tubes have a thermally conductive connection to at least one duct for the one medium flow. Each fin is fixed only to the one longitudinal side of each tube. Furthermore, there is a gap between the fins fixed to the one longitudinal side and the opposite longitudinal side of the tube.
    Type: Grant
    Filed: March 13, 2006
    Date of Patent: March 20, 2012
    Assignee: Volvo Lastvagnar AB
    Inventor: Hans-Gunnar Qvist
  • HEAT EXCHANGER FOR EGR-GAS
    Publication number: 20090025915
    Abstract: A heat exchanger for a first and a second medium flow includes flat tubes which have internal fins formed from zigzag-shaped sheet metal plate. The tubes have a thermally conductive connection to at least one duct for the one medium flow. Each fin is fixed only to the one longitudinal side of each tube. Furthermore, there is a gap between the fins fixed to the one longitudinal side and the opposite longitudinal side of the tube.
    Type: Application
    Filed: March 13, 2006
    Publication date: January 29, 2009
    Applicant: VOLVO LASTVAGNAR AB
    Inventor: Hans-Gunnar Qvist