US Patent 6843278 Flexible duct with shrinkage-proof film
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Patent abstract
The invention concerns a flexible duct (1) comprising from inside outwards a carcass (2) produced by a short-pitched metallic helical winding forming butt gaps (12), an overlapping layer (10) acting as a heat shield consisting of helically wound plastic strips (10a, 10b), a sealed inner pressure sheath (3), extruded in plastic on said overlapping layer (10), at least an armouring web (5) and at least an outer sealing sheath (7). The invention is characterised in that the overlapping strips (10a, 10b) are wound at a winding angle less than 35°.
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Patent Inventor Names
Philippe François Espinasse0
Date of Patent
January 18, 2005
0Patent Application Number
104680880
Date Filed
February 18, 2002
0Patent Primary Examiner
Edits on 11 Oct, 2023
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US Patent 6843278 Flexible duct with shrinkage-proof film
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