Patents by Inventor Carl H. Ahlen

Carl H. Ahlen 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 heating a transport pipeline, as well as transport pipeline with heating
    Patent number: 5241147
    Abstract: A method and apparatus for heating a transport pipeline by inductive heating. The transport pipeline has a thermal insulator mounted on an outside surface thereof. A pair of parallel extending electric wires without metallic protection, are mounted on an outside surface of the thermal insulator.
    Type: Grant
    Filed: April 30, 1991
    Date of Patent: August 31, 1993
    Assignee: Den Norske Stats Oljeselskap A.S.
    Inventor: Carl H. Ahlen