Hernani G Deocampo

6695059, Feb 24, 2004

Oct 22, 2001

10/027468

Sean P. Thomas - Houston TX
Hernani G. Deocampo - Houston TX

ABB Vetco Gray Inc. - Houston TX

E21B 33035

166368, 166382, 166208

An anti-rotation device prevents an inner wellhead housing from rotating within an outer wellhead housing. The anti-rotation device provides spring loaded anti-rotational keys within the outer wellhead housing and mating slots formed within the inner wellhead housing. The keys face inwards to the inner wellhead housing, are circumferentially spaced apart around the outer wellhead housing, and located between the two tapered shoulders. As the inner wellhead housing lands in the outer housing, the inner wellhead housing pushes the keys of the outer wellhead housing to a retracted position. The inner wellhead housing is then rotated within the outer wellhead housing until the spring loaded keys align with the slots and extend into the slots of the inner wellhead housing. Any rotational force on the inner wellhead housing will be resisted by the anti-rotational mechanism.

53703626, Dec 6, 1994

Oct 15, 1993

8/137653

Peter M. Kent - Greengates Warthill by Inverurie, GB6
Anton J. Dach - Houston TX
Hernani G. Deocampo - Houston TX
Ted D. Williams - Houston TX

ABB Vetco Gray Inc. - Houston TX

F16K 100

251326

An improved gate for a gate valve will allow shearing of a wireline extending through the gate valve while preserving post-shear seal integrity. The improved gate comprises an inlay of a hard ductile material such as Stellite along the shearing edge of the gate. The gate also comprises a coating of an extremely hard material such as tungsten carbide on the sealing surface of the gate. The invention also covers an improved gate seat. The improved seat also comprises an inlay of a hard ductile material such as Stellite along its shearing edge. The improved seat can also have a coating of an extremely hard material such as tungsten carbide on part of its sealing surface.