Patents by Inventor Anne Elise Hystad

Anne Elise Hystad 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).

  • Patent number: 6000278
    Abstract: A device serves to enable detection of leakages in flange joints in pipelines. Between end faces (22, 24) adjacent, opposing flange pipe ends, a packer (30') has been disposed, the packer being adapted to bear sealingly against seat faces which said end faces (22, 24) exhibit. At each of the opposite side faces of the packer (30'), an annular groove (26', 28') has been formed, said annular grooves being closed and thereafter forming annular cavities when the joint has been established. Between at least one cavity (28') and the surroundings outside the pipeline (14, 16), a fluid connection (38') is established. The packer (30') is formed with a through-going hole (32') establishing fluid-communication between the two annular cavities (26', 28').
    Type: Grant
    Filed: April 27, 1998
    Date of Patent: December 14, 1999
    Inventor: Anne Elise Hystad
  • Patent number: 5810578
    Abstract: A device for burning gas from a production plant for oil/gas comprising a burner at the top of a flare pipe (8). The production plant is connected to the flare pipe (8) through a low pressure collection line (1) for process gas. The device reduces combustion of valuable production gas to a minimum. To this end, the collection line (1) is connected to an expansion tank (2) having a return line (4) to the production plant and, downstream relative to the expansion tank (2), a liquid trap (6) has been disposed.
    Type: Grant
    Filed: June 5, 1997
    Date of Patent: September 22, 1998
    Inventors: Harald Hystad, deceased, by Anne Elise Hystad, legal representative