Patents by Inventor David James Mathis

David James Mathis 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).

  • Subsea tree safety control system
    Patent number: 8602108
    Abstract: An embodiment of a method for limiting the probability of failure on demand of a subsea test tree (“SSTT”) includes the steps of providing a safety shut-in system for actuating a safety valve of the SSTT, the safety shut-in system including a surface control station positioned above a water surface connected via an umbilical to a subsea control system positioned below the water surface to actuate the safety valve; and diagnostically testing the safety shut-in system without actuating the safety valve.
    Type: Grant
    Filed: December 4, 2012
    Date of Patent: December 10, 2013
    Assignee: Schlumberger Technology Corporation
    Inventor: David James Mathis