Pipe joints or couplings – Particular interface – Tapered
Reexamination Certificate
2007-07-17
2007-07-17
Dunwoody, Aaron (Department: 3679)
Pipe joints or couplings
Particular interface
Tapered
C285S334000
Reexamination Certificate
active
11026512
ABSTRACT:
A threaded connection includes a continuous pin thread including at least a first step, a mid-step, and a second step formed sequentially thereon. A continuous box thread includes at least a first step, a mid-step, and a second step formed sequentially thereon, wherein the steps on the box thread correspond generally in axial position with the steps on the pin thread. The first step has a first wedge ratio, the mid-step has a transition wedge ratio, and the second step has a second wedge ratio, wherein thread leads are substantially constant within each of the steps. The connection is designed such that at make-up of a pin member with a box member, a clearance exists between at least one of corresponding load flanks and corresponding stab flanks on at least one of the first step, the mid-step, and the second step.
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Dunwoody Aaron
Hydril Company LP
Kee Fannie C.
Osha & Liang LLP
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