Patents by Inventor Steven N. Rolen

Steven N. Rolen 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).

  • Sub-surface release plug assembly with primary and secondary release mechanisms
    Patent number: 5392852
    Abstract: A sub-surface release plug assembly for use in cementing an outer casing annulus around a well casing comprising a top plug releasably connected to a drill string by a collet mechanism and a bottom plug releasably attached to the top plug by a sleeve assembly extending through the top plug. The assembly further comprises primary and secondary release means for releasing said plugs thereby ensuring that the plugs are released in said casing during cementing operations.
    Type: Grant
    Filed: November 16, 1992
    Date of Patent: February 28, 1995
    Assignee: Halliburton Company
    Inventors: David F. Laurel, Steven N. Rolen