Patents by Inventor Lars Jenssen

Lars Jenssen 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).

  • Method for reducing frictional losses in tunnels
    Patent number: 6533500
    Abstract: A method for reducing frictional loss in unlined tunnels or other tunnels with a rough wall surface and/or irregular cross section. A flexible or rigid pipe with a cross section similar to or somewhat less than the largest circular open cross section of the tunnel is introduced into the tunnel and attached continuously or at certain points to parts of the tunnel wall. Apparatus for ensuring that a superpressure occurs within the pipe relative to its outside during flow are also introduced.
    Type: Grant
    Filed: October 4, 2001
    Date of Patent: March 18, 2003
    Assignee: Leiv Eiriksson Nyfotek AS
    Inventors: Tom Jacobsen, Lars Jenssen