Patents by Inventor Keith D. Farquharson

Keith D. Farquharson 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).

  • Metal seal for wellheads
    Patent number: 8066061
    Abstract: A reusable metal seal for a wellhead provides a metal-to-metal seal and includes upper and lower tapered sealing flanks which may be deflected by tapered wall surfaces on the wellhead engaging the taper sealing flanks, and the seal may have a plurality of annular relief grooves.
    Type: Grant
    Filed: April 27, 2009
    Date of Patent: November 29, 2011
    Assignee: Stream-Flo Industries Ltd.
    Inventors: Keith D. Farquharson, Tianle Guo, Heinrich Lang, Tony Lam, Kevin Paul Schneider
  • METAL SEAL FOR WELLHEADS
    Publication number: 20090266558
    Abstract: A reusable metal seal for a wellhead provides a metal-to-metal seal and includes upper and lower tapered sealing flanks which may be deflected by tapered wall surfaces on the wellhead engaging the taper sealing flanks, and the seal may have a plurality of annular relief grooves.
    Type: Application
    Filed: April 27, 2009
    Publication date: October 29, 2009
    Inventors: Keith D. Farquharson, Tinale Guo, Heinrich Lang, Tony M. Lam, Kevin Paul Scheider
  • Wellhead stuffing box support assembly
    Patent number: 6637509
    Abstract: A stuffing box support assembly is configured to be positioned between a production pumping tree and a stuffing box of a wellhead. In use, the support assembly functions like a joint between the wellhead production tree and the stuffing box. The support assembly is configured such that it could tilt or move laterally to maintain a coaxial relationship between the stuffing box and a polished rod extending therethrough. This alignment between the stuffing box and the polished rod reduces wear and tear of the stuffing box packing.
    Type: Grant
    Filed: January 4, 2002
    Date of Patent: October 28, 2003
    Assignee: Stream-Flo Industries Ltd.
    Inventors: Keith D. Farquharson, Daniel J. Riddell
  • Wellhead stuffing box support assembly
    Publication number: 20030127220
    Abstract: The support assembly functions like a joint between the wellhead production tree and the stuffing box. The joint can tilt or move laterally to maintain coaxial relationship between the stuffing box and the polished rod extending therethrough.
    Type: Application
    Filed: January 4, 2002
    Publication date: July 10, 2003
    Inventors: Keith D. Farquharson, Daniel J. Riddell
  • Wellhead production pumping tree
    Patent number: 6457530
    Abstract: A monolithic pumping tree combining a bottom connection, production blow-out preventer section, flow tee section and top connection is cast so as to provide an access port extending downwardly through the side wall of the tree from its outer surface, to connect with either the central vertical bore of the tree or its horizontal bottom surface, thereby enabling coiled tubing to be inserted either into the tubing string bore or into the annulus between the tubing and production casing strings.
    Type: Grant
    Filed: March 23, 2001
    Date of Patent: October 1, 2002
    Assignee: Stream-Flo Industries, Ltd.
    Inventors: Tony M. Lam, Keith D. Farquharson, Daniel J. Riddell
  • WELLHEAD PRODUCTION PUMPING TREE
    Publication number: 20020134548
    Abstract: A monolithic pumping tree combining a bottom connection, production blow-out preventer section, flow tee section and top connection is cast so as to provide an access port extending downwardly through the side wall of the tree from its outer surface, to connect with either the central vertical bore of the tree or its horizontal bottom surface, thereby enabling coiled tubing to be inserted either into the tubing string bore or into the annulus between the tubing and production casing strings.
    Type: Application
    Filed: March 23, 2001
    Publication date: September 26, 2002
    Inventors: Tony M. Lam, Keith D. Farquharson, Daniel J. Riddell
  • Hydraulic blowout preventer assembly for production wellhead
    Patent number: 6260817
    Abstract: In the hydraulic blowout preventer of an integral production wellhead, the ram chambers and hydraulic fluid supply line are both buried or formed in the side wall of the blowout preventer.
    Type: Grant
    Filed: October 29, 1999
    Date of Patent: July 17, 2001
    Assignee: Stream-Flo Industries, Ltd.
    Inventors: Tony M. Lam, Keith D. Farquharson
  • Composite pumping tree with integral shut-off valve
    Patent number: 6176466
    Abstract: A unitary pumping tree is provided for forming part of a wellhead assembly christmas tree. The tree integrates a bottom connector, shut-off valve, hydraulically actuated blow-out preventer, mechanically actuated blow-out preventer, flow tee and top connector, within a body formed as a single piece of steel.
    Type: Grant
    Filed: August 24, 1999
    Date of Patent: January 23, 2001
    Assignee: Steam-Flo Industries, Ltd.
    Inventors: Tony M. Lam, Keith D. Farquharson
  • Piston-type check valve with diffuser
    Patent number: 5921276
    Abstract: An axial recess is formed in the downstream end of the diffuser body. An annular tail member is mounted on the downstream end of the valve piston. The tail member retracts into the recess when the piston is in the closed position and provides an extension of the diffuser body when the piston is in the open position.
    Type: Grant
    Filed: October 17, 1995
    Date of Patent: July 13, 1999
    Assignee: Stream-Flo Industries, Ltd.
    Inventors: Tony M. Lam, Keith D. Farquharson
  • Wellhead production blowout preventer ram
    Patent number: 5765813
    Abstract: The rubber layer on the ram is reinforced at the sealing areas by forming ribs on the ram core. The ribs function to resist extrusion of the rubber layer when the blowout preventer is subjected to high pressure from the well.
    Type: Grant
    Filed: May 30, 1996
    Date of Patent: June 16, 1998
    Assignee: Stream-Flo Industries, Ltd.
    Inventors: Tony M. Lam, Keith D. Farquharson
  • Integral wellhead assembly for pumping wells
    Patent number: 5743332
    Abstract: The adapter, blow-out preventer housing and flow tee of an oilwell wellhead assembly are formed together as a one-piece or integral structure. The structure has a bottom flanged connection and a top studded and internally threaded connection. By eliminating threaded connections and the adapter body, the length of the combined assembly is reduced by about 50% and structural strength is improved.
    Type: Grant
    Filed: February 16, 1996
    Date of Patent: April 28, 1998
    Assignee: Stream-Flo Industries Ltd.
    Inventors: Tony M. Lam, Keith D. Farquharson