Patents by Inventor Alistair D. Crozier

Alistair D. Crozier 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: 7621338
    Abstract: A wellhead assembly includes a tree cap having a production mandrel extending down into a production passage of a Christmas tree to form a seal. The tree has an annulus bore and an annular cavity at the upper end of the tree surrounding the upper ends of the production and annulus bore. A communication gallery leads between the annulus bore and the cavity. The tree cap also includes an annular sealing member that enters the cavity for sealing a communication gallery.
    Type: Grant
    Filed: July 27, 2007
    Date of Patent: November 24, 2009
    Assignee: Vetco Gray Inc.
    Inventors: Michael A. Wenham, Alistair D. Crozier
  • Publication number: 20090025939
    Abstract: A wellhead assembly includes a tree cap having a production mandrel extending down into a production passage of a Christmas tree to form a seal. The tree has an annulus bore and an annular cavity at the upper end of the tree surrounding the upper ends of the production and annulus bore. A communication gallery leads between the annulus bore and the cavity. The tree cap also includes an annular sealing member that enters the cavity for sealing a communication gallery.
    Type: Application
    Filed: July 27, 2007
    Publication date: January 29, 2009
    Applicant: VETCO GRAY INC.
    Inventors: Michael A. Wenham, Alistair D. Crozier
  • Patent number: 7240735
    Abstract: A subsea wellhead including a wellhead housing having a bore with a grooved profile. An upper portion of the bore has a greater diameter than a lower portion of the bore, and a central conical portion of the bore joins the upper portion of the bore and the lower portion of the bore. A connector body lands in the wellhead housing. The connector body has a conical section that interfaces with the central conical portion of the bore. A seal is secured between the central conical portion of the bore of the wellhead housing and the conical section of the connector body at the interface of the wellhead housing and the connector body. A locking element is carried on the connector body. The locking element has an outer side that engages the grooved profile of the wellhead housing.
    Type: Grant
    Filed: December 9, 2004
    Date of Patent: July 10, 2007
    Assignee: Vetco Gray Inc.
    Inventor: Alistair D. Crozier