Method for introducing an internal helical formation into a flexible tubular material
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United States of America Patent
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Jun 28, 2011
Grant Date -
Dec 25, 2008
app pub date -
Apr 10, 2008
filing date -
Nov 20, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
There is disclosed a method for introducing a helical formation (11) into a flexible tubular material (12). The material (12) is supported together with a surrounding helical former (13) so as to deform the material (12) to have a helical indentation (11) corresponding to the shape of the former (13). The material (12) is then set in that configuration and the former (13) is removed.
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