Threads with perturbations

Details Threads with perturbations Threads with perturbations

2011-05-17

2011-05-17

Bochna, David E (Department: 3679)

Pipe joints or couplings

Particular interface

Tapered

C285S334000

Reexamination Certificate

active

07942454

ABSTRACT:
A threaded connection includes a pin member including a pin thread having a pin thread crest, a pin thread root, a pin load flank, and a pin stab flank, and a box member including a box thread having a box thread crest, a box thread root, a box load flank, and a box stab flank, wherein at least one of the pin thread crest, the pin thread root, the box thread crest, and the box thread root has at least one perturbation formed thereon. Upon a selected make-up of the pin member with the box member, a localized clearance or a localized interference exists between the pin thread and the box thread at the at least one perturbation, wherein the localized clearance between the pin thread and the box thread exists across substantially the entire pin thread crest or substantially the entire box thread crest, and wherein the localized interference between the pin thread and the box thread exists across substantially the entire pin thread crest or substantially the entire box thread crest.

REFERENCES:
patent: 2788046 (1957-04-01), Rosan
patent: 7458616 (2008-12-01), Reynolds, Jr.
Office Action in corresponding U.S. Appl. No. 11/614,655 dated May 20, 2010. 21 pages.
Notice of Allowance issued in related U.S. Appl. No. 11/678,501; dated Jun. 14, 2010 (10 pages).
Notice of Allowance issued in related U.S. Appl. No. 11/752,646; dated Jun. 14, 2010 (6 pages).
Notice of Allowance issued in related U.S. Appl. No. 11/678,501; dated Jul. 6, 2010 (6 pages).
Notice of Allowance issued in related U.S. Appl. No. 11/752,646; dated Jul. 13, 2010 (7 pages).

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