Patents by Inventor K. P. Kristjansson

K. P. Kristjansson 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 with a valve function
    Patent number: 4941511
    Abstract: Device with valve function which can be brought into and out of a pipeline and parked in the same. The device comprises a channel for throughflowing fluid, a valve (2) which is medium controlled and/or remote-controlled, a parking brake/packer seal unit (9) which with limited force can be brought to bear against the wall of the pipeline, a cylindrical wire anchor (1) with an external diameter which is slightly lesser than the internal diameter of the pipeline and can be brought into pressure contact with the pipeline.
    Type: Grant
    Filed: May 6, 1988
    Date of Patent: July 17, 1990
    Assignee: Den norske stats oljeselskap a.s
    Inventors: Trond V. Johansen, Ola Ruch, Ludvig Naess, K. P. Kristjansson, S. F. Utengen