Patents by Inventor Daniel J. Wolterman

Daniel J. Wolterman 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).

  • Composite assembly having improved load transmission between a flexible tubular pipe section and a rigid end fitting via respective annular coupling grooves
    Patent number: 6050612
    Abstract: A composite drill pipe has an improved means of attaching a metal end fitting to a composite tubular member using corresponding annular grooves in the metal end fitting and the composite tubular member. In addition to annular grooves for axial loads, a plurality of axial grooves can also be included to accommodate greater torsional loads. The composite pipe body can also include a buildup made of a compliant rubber layer, a composite overwrap, and a wear pad in order to reduce the effective buckling node spacing to even further increase the axial load capability.
    Type: Grant
    Filed: September 30, 1997
    Date of Patent: April 18, 2000
    Assignee: SpyroTech Corporation
    Inventor: Daniel J. Wolterman