Patents by Inventor Parviz Abadi

Parviz Abadi 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: 6659690
    Abstract: A stress joint for a subsea riser has a reduced diameter intermediate section to reduce bending stresses on the connection between the stress joint and the riser as well as the subsea equipment. The stress joint having a riser joint with a threaded upper end for connection to a riser string. Attached to a lower end of the riser joint is an upper transition section that tapers from the diameter of the riser joint to a reduced diameter. An intermediate section below the upper transition section has a reduced outer diameter. A lower transition section connects the lower end of the intermediate section to the subsea equipment. The lower transition section is tapered from a reduced diameter to a larger diameter to ensure a firm connection with the subsea equipment.
    Type: Grant
    Filed: October 18, 2001
    Date of Patent: December 9, 2003
    Assignee: ABB Vetco Gray Inc.
    Inventor: Parviz Abadi