Patents by Inventor Jan Erik Vollebregt

Jan Erik Vollebregt 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).

  • Forge welding tubulars
    Patent number: 7774917
    Abstract: Tubular ends are heated to a predetermined temperature above 1200 degrees Celsius and surrounded by a shield gas when the tubular ends are pressed together to form forge welded tubular ends. The forge welded tubular ends are then cooled down rapidly from said temperature above 1200 to at most 600 degrees Celsius within 3 minutes after the forge welding operation.
    Type: Grant
    Filed: November 7, 2006
    Date of Patent: August 17, 2010
    Assignee: Tubefuse Applications B.V.
    Inventors: Mark Wilson Anderson, Johannis Josephus Den Boer, Anthony Thomas Cole, Klisthenis Dimitriadis, Jan Erik Vollebregt, Djurre Hans Zijsling
  • Joining expandable tubulars
    Patent number: 7181821
    Abstract: A method of joining expandable tubulars includes joining the tubulars by forge welding and flushing a reducing flushing gas around the heated tubular ends during at least part of the forge welding operation such that oxides are removed from the forge welded tubular ends and the amount of irregularities between the forge welded tubular ends is limited.
    Type: Grant
    Filed: July 17, 2003
    Date of Patent: February 27, 2007
    Assignee: Shell Oil Company
    Inventors: Mark Wilson Anderson, Johannis Josephus Den Boer, Anthony Thomas Cole, Klisthenis Dimitriadis, Jan Erik Vollebregt, Djurre Hans Zijsling
  • EMAT weld inspection
    Patent number: 6896171
    Abstract: A method for inspecting welds between welded tubular ends includes arranging a series electromagnetic acoustic transducer (EMAT) assemblies in circumferential direction adjacent to an inner and/or outer surface of at least one of the welded tubular ends and inducing the EMAT assemblies to transmit sequentially or simultaneously acoustic shear wave signals towards the weld and to detect the shear waves reflected by and/or passing through the weld while the EMAT assemblies are maintained in a substantially fixed position relative to the weld such that at least a substantial part of the weld is scanned by the EMAT assemblies instantly after the weld is made.
    Type: Grant
    Filed: July 17, 2003
    Date of Patent: May 24, 2005
    Assignee: Shell Oil Company
    Inventors: Johannis Josephus Den Boer, Anthony Thomas Cole, Klisthenis Dimitriadis, Dirk Arie Kronemeijer, Jan Erik Vollebregt
  • EMAT weld inspection
    Publication number: 20040134970
    Abstract: A method for inspecting welds between welded tubular ends includes arranging a series electromagnetic acoustic transducer (EMAT) assemblies in circumferential direction adjacent to an inner and/or outer surface of at least one of the welded tubular ends and inducing the EMAT assemblies to transmit sequentially or simultaneously acoustic shear wave signals towards the weld and to detect the shear waves reflected by and/or passing through the weld while the EMAT assemblies are maintained in a substantially fixed position relative to the weld such that at least a substantial part of the weld is scanned by the EMAT assemblies instantly after the weld is made.
    Type: Application
    Filed: July 17, 2003
    Publication date: July 15, 2004
    Inventors: Johannis Josephus Den Boer, Anthony Thomas Cole, Klisthenis Dimitriadis, Dirk Arie Kronemeijer, Jan Erik Vollebregt