Patents by Inventor Luis A. G. Araujo

Luis A. G. Araujo 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).

  • Internal tieback connector
    Patent number: 4976458
    Abstract: A tieback system for a subsea well utilizes a tieback connector. The tieback connector has a body that lands on a wellhead housing located on a sea floor. A funnel extends downward from the body for sliding over the wellhead housing. A lockdown sub is carried by the body and has a set of tapered threads on its exterior. A lock ring is carried by the lockdown sub. The lock ring has an exterior profile for engaging an internal groove formed in the wellhead housing. Rotating the lockdown sub moves it downward from a recessed position to a locking position. In that position, the rotation causes makeup to the threads and causes the lock ring profile to tightly engage the groove in the wellhead housing.
    Type: Grant
    Filed: October 16, 1989
    Date of Patent: December 11, 1990
    Assignee: Vetco Gray Inc.
    Inventors: Stanley Hosie, Luis A. G. Araujo