Patents by Inventor Nils Chr. Hagen

Nils Chr. Hagen 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 and device for thermite welding at large water depths
    Patent number: 6131801
    Abstract: Method and device to join the ends of two cylindrical objects by welding at deep water without the use of divers, where the ends of the two objects are connected with an inner casing inside an outer casing thereby creating a closed chamber around the joint between the inner and outer casings, evacuating the chamber and initiating a thermite welding process, the closed chamber thereby being filled with metal and establishing a mould sealingly connected with the outer surface of the two objects and abridging the distance between the two objects.
    Type: Grant
    Filed: February 22, 1999
    Date of Patent: October 17, 2000
    Inventor: Nils Chr. Hagen