CHAU M HOANG
Electrician at Pompano Ln, Houston, TX

6454015, Sep 24, 2002

Jul 5, 2000

09/610392

John Taylor Armstrong - Banchory, GB
Ian Gourlay - Bridge of Don, GB
Peter Kent - Inverurie, GB
Chau Hoang - Houston TX

ABB Vetco Gray Inc. - Houston TX

E21B 3306

166387, 166373, 166 854, 166 863

A gate valve has downstream shear and seal capabilities in which the gate will stroke far enough to cover the downstream seat interface, and has a single shearing surface for shearing of a wireline. The gate has an inlay of a hard ductile material such as Stellite® along the shearing edge of the gate. The gate also has a coating of an extremely hard material such as tungsten carbide on the sealing surface of the gate. The seat also has an inlay of a hard ductile material such as Stellite® along its shearing edge. The gate fully covers and seals the upstream seat interface after the shear media has fallen below the upstream gate/seat interface. An upstream lip seal for the upstream seat ring is energized to seal on upstream pressure.

2014006, Mar 6, 2014

Sep 5, 2012

13/603951

Mihirkumar Pravinbhai Patel - Bangalore, IN
David D. Comeaux - Houston TX, US
Michael J. Denk - Houston TX, US
Chau Hoang - Houston TX, US

VETCO GRAY INC. - Houston TX

F16K 25/00

251193

An actuator for a gate valve having a gate has a stem coupled to a gate. A spring is coupled to the stem and has an extended length position while the gate is in a closed position and a contracted length position while the gate is in an open position. The spring has a degressive characteristic such that a graph of a force required to move the gate from the closed position to the open position versus a deflection of the spring is a nonlinear curve with a positive slope that decreases when moving from the closed to the open position. The spring may be an array of wavy springs arranged in nested and in valley-to-crest combinations.

2013034, Dec 26, 2013

Jun 22, 2012

13/530943

William Thompson Higgins - Houston TX, US
John E. Nelson - Houston TX, US
Chau Hoang - Houston TX, US

Vetco Gray, Inc. - Houston TX

E21B 33/12

166387, 166196

A wellhead assembly having an inner tubular insertable into an outer tubular. A packoff is provided on an outer surface of the inner tubular for sealing between the inner and outer tubulars. The packoff includes an energizing ring, a U-shaped seal member, and a nut for retaining the seal member against the energizing ring. The seal member includes legs that are spaced apart by interaction with the energizing ring. The outer tubular has a bore wall that is profiled so that when the inner tubular is inserted into the outer tubular, an outer leg of the seal member is spaced radially outward from the bore wall until the inner tubular is landed in the outer tubular. When the inner tubular member is landed, a portion of the bore wall adjacent the outer leg tapers radially inward into sealing contact with the outer leg of the seal member.

2013024, Sep 19, 2013

Mar 13, 2012

13/419083

Chau Hoang - Houston TX, US
David Daniel Comeaux - Houston TX, US
Theerapong Prachakvej - Houston TX, US

VETCO GRAY INC. - Houston TX

F16K 3/00

251329

A gate valve assembly having a body, a gate, a stem, and a backseat for sealing between the stem and the body. The backseat is an annular member with a complementary surface on its inside that fits over a spherically shaped section of the stem; thus allowing the backseat to rotate and pivot with respect to the stem. An outer surface of the backseat is beveled for sealingly engaging a stem passage formed through the body. A flex member is provided that is for sealing a surface adjacent the backseat. The flex member can form a seal between the backseat member and the stem or between an annular retainer and the backseat.

2014006, Mar 6, 2014

Aug 28, 2012

13/596544

Chau Hoang - Houston TX, US
Khanh Anh Duong - Houston TX, US
William Ryan Moore - Houston TX, US
Karl A. Parfrey - Houston TX, US
Clayton Griffin - Houston TX, US

Vetco Gray Inc. - Houston TX

E21B 33/03, F16L 21/02

277314, 277328

A seal assembly for use with a casing hanger that includes a pair of split rings held together by a threaded fastener. Torqueing the fastener axially compresses one of the rings so that it expands radially inward into sealing engagement with a wall of wellbore casing, and radially outward against an inner wall of a wellhead housing. Support grommets are provided where the fastener enters and exits the compressible ring. Protrusions on a side of the support grommets project into the compressible ring and create a sealing interface between each support grommet and compressible ring. O-rings line inner circumferences of the support grommets to seal between the support grommets and fasteners. A threaded end on a lower end of the fastener has a diameter less than an inner diameter of the O-rings to prevent damaging the O-rings during assembly.