Winding – tensioning – or guiding – Coil holder or support – Spool or core
Reexamination Certificate
2005-02-08
2005-02-08
Jillions, John M. (Department: 3654)
Winding, tensioning, or guiding
Coil holder or support
Spool or core
C242S610100, C242S118320, C138S144000, C156S195000, C156S429000, C428S034200, C428S037000
Reexamination Certificate
active
06851643
ABSTRACT:
Wide ply gaps are intentionally introduced into one or more plies in a radially intermediate zone of the wall of a spirally wound tube. Each ply having wide ply gaps is narrower than the width that would ordinarily be employed at a given spiral winding angle to achieve a butt joint between adjacent edges of consecutive turns of the ply, and the ply is wound at that given spiral winding angle in such a manner that gaps are defined between the adjacent edges of the consecutive turns of the ply. The wide ply gaps have the effect of increasing the compliance of the intermediate zone of the tube wall in the radial direction. Such increased radial compliance has been found to improve the ID stiffness of the tube relative to a tube constructed of the same materials but having no ply gaps in the intermediate zone.
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International Search Report; PCT Application No. PCT/US03/08594, Filed Mar. 21, 2003; Date of Completion Oct. 10, 2003; Date Mailed Feb. 17, 2004.
Bellum Cliff A.
Burns Mark P.
Niu Xiaokai
Qiu Yanping
van de Camp Johannes W.
Alston & Bird LLP
Jillions John M.
Sonoco Development Inc.
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