David L Mallis

6530607, Mar 11, 2003

Nov 6, 2000

09/707278

David L. Mallis - The Woodlands TX

Hydril Company - Houston TX

F16L 1500

285333, 285334, 285390

A threaded connector includes a pin member having a large thread step and a small thread step. The pin member has a first sealing surface between the steps. Threads on the steps of the pin member each have load flanks and stab flanks. The connector includes a box member having a large thread step and a small thread step corresponding to the thread steps on the pin member. The box member has a second sealing surface corresponding to the first sealing surface. Threads on the steps of the box member have load flanks and stab flanks corresponding to the threads on the pin member. The threads on the large thread step have a first clearance between corresponding stab flanks on the pin and box members when the pin and box members are assembled and the corresponding load flanks are engaged. The threads on the small step have a second clearance between corresponding stab flanks when the pin and box members are assembled. The first clearance in one embodiment is smaller than the second clearance.

6626471, Sep 30, 2003

Aug 6, 2001

09/922825

David Llewellyn Mallis - The Woodlands TX

Hydril Company - Houston TX

F16L 2500

285334, 285390, 285355, 285333

A threaded tubular connection has a box member including an internal thread, a pin member including an external thread engageable with the internal thread of the box member, and a protruding sealing surface disposed in the box member such that the pin member flexes radially inward upon passing the protruding sealing surface during make-up. The threaded tubular connection also has a recessed seal cavity disposed in the box member and a reverse angle shoulder at the pin nose that forces the pin member to flex radially outward into the recessed seal cavity of the box member upon final make-up. A method of forming a double flex seal for a tubular connection includes engaging an internal thread of a pin member with an external thread of a box member and flexing a pin nose of the pin member radially inward by passing the pin nose over a protruding sealing surface of the box member during make-up. The method also includes flexing the pin nose radially outward when a reverse angle shoulder of the pin nose comes into contact with a reverse angle shoulder of the box member during make-up and completing the double flex seal by finally making up the connection such that the pin nose of the pin member seats in a recessed seal cavity disposed in the box member.

7014212, Mar 21, 2006

Apr 26, 2001

09/843560

David Mallis - The Woodlands TX, US

Hydril Company LP - Houston TX

F16L 55/00
B23Q 17/00

285 93, 285333, 285334, 2940701, 29456

A threaded pipe connection includes a box member, a pin member and a wear indicator for the connection. The pin member has internal threads and the box member has external threads. The internal threads of the box member each increase in width in one direction, while the external threads of the pin member increase in width in the other direction so that the complementary internal and external threads move into engagement upon make-up of the connection.

7527304, May 5, 2009

Dec 30, 2004

11/027015

David Llewellyn Mallis - The Woodlands TX, US

Hydril LLC - Houston TX

F16L 15/00

285390, 285333

A tubular connection is provided with a first thread on a first step having an initial makeup location and a second thread on a second step, the second thread being a wedge thread and having a selected clearance on stab and load flanks at the initial makeup location of the first thread.

7575255, Aug 18, 2009

Jun 16, 2006

11/424783

David Llewellyn Mallis - The Woodlands TX, US

Hydril LLC - Houston TX

F16L 25/00

285333, 285334

A threaded connection includes a pin member providing a single external thread comprising a first external portion and a second external portion, a box member providing a single internal thread comprising a first internal portion and a second internal portion, and a radial metal-to-metal seal to seal between the pin member and the box member, wherein the first and second internal portions threadably correspond with the first and second external portions, and wherein the first internal and external portions are characterized by a first wedge ratio and the second internal and external portions are characterized by a second wedge ratio, wherein the first wedge ratio is less than the second wedge ratio.

7690696, Apr 6, 2010

Oct 15, 2001

09/977746

David Llewellyn Mallis - The Woodlands TX, US
Harris Allen Reynolds - Houston TX, US

Hydril Company - Houston TX

F16L 25/00

285334, 29456

A threaded pipe connection including a pin member having an external thread increasing in width in one direction, the external thread including load and stab flanks, a box member having an internal thread increasing in width in the other direction so that complementary internal and external threads move into engagement upon make-up of the connection, the internal thread comprising load and stab flanks, a positive stop torque shoulder, and wherein the width of the internal thread and external thread are selected to provide a selected clearance at least between the internal load and stab flanks and the external load and stab flanks upon initial engagement of the positive stop torque shoulder is disclosed.

7988205, Aug 2, 2011

Jan 21, 2010

12/691465

David Llewellyn Mallis - The Woodlands TX, US

Hydril Company - Houston TX

F16L 25/00

285334, 285333

A threaded pipe connection includes a pin member having an external thread increasing in width in one direction, a box member having an internal thread increasing in width in an opposite direction so that complementary internal and external threads move into engagement upon make-up of the connection, and at least one contact zone in which the pin member and box member are in sealed contact.

8496274, Jul 30, 2013

Dec 2, 2011

13/310241

David Llewellyn Mallis - The Woodlands TX, US
Gary W. Ward - Conroe TX, US

Hydril Company - Houston TX

F16L 25/00

285334, 285333

A threaded connection includes a pin member comprising a first pin step and a second pin step, and pin wedge threads disposed on each of the first and second pin steps and a box member comprising a first box step and a second box step, and box wedge threads disposed on each of the first and second box steps, wherein an axial separation of the first and second pin steps differs from an axial separation of the first and second box steps.