Patents by Inventor Alv Hanstvedt

Alv Hanstvedt 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).

  • Device and a method for drainage of water from rock caves
    Patent number: 7513712
    Abstract: A device of a water draining system for caverns is described, comprising one or more sections of tunnel covering or tunnel canvas which is arranged in the cavern at a certain distance from the walls and ceiling of the cavern, and a draining pipe system for leading away water.
    Type: Grant
    Filed: October 15, 2004
    Date of Patent: April 7, 2009
    Assignee: Giertsen Tunnel AS
    Inventor: Alv Hanstvedt
  • Device and a method for drainage of water from rock caves
    Publication number: 20050097845
    Abstract: A device of a water draining system for caverns is described, comprising one or more sections of tunnel covering or tunnel canvas which is arranged in the cavern at a certain distance from the walls and ceiling of the cavern, and a draining pipe system for leading away water.
    Type: Application
    Filed: October 15, 2004
    Publication date: May 12, 2005
    Applicant: Giertsen Tunnel AS
    Inventor: Alv Hanstvedt