US 11,913,593 B2
Blowable flexible innerduct
Steven L Bedingfield, LaGrange, GA (US); and Andrew Broadway, Fountain Inn, SC (US)
Assigned to Milliken & Company, Spartanburg, SC (US)
Filed by Milliken & Company, Spartanburg, SC (US)
Filed on Nov. 10, 2022, as Appl. No. 17/984,849.
Claims priority of provisional application 63/286,890, filed on Dec. 7, 2021.
Prior Publication US 2023/0175613 A1, Jun. 8, 2023
Int. Cl. F16L 7/00 (2006.01); D03D 1/02 (2006.01); D03D 3/02 (2006.01); D03D 15/283 (2021.01)
CPC F16L 7/00 (2013.01) [D03D 1/02 (2013.01); D03D 3/02 (2013.01); D03D 15/283 (2021.01); D10B 2331/02 (2013.01); D10B 2331/04 (2013.01); D10B 2505/20 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A process of forming a blowable flexible innerduct comprising:
forming an inner innerduct structure comprising at least one inner longitudinal chamber, wherein the at least one inner longitudinal chamber comprises an inflatable tube;
forming a textile;
concurrently forming an outer innerduct structure from the textile having at least one outer longitudinal chamber and inserting the at least one inner longitudinal chamber into at least one of the outer longitudinal chambers, wherein the inflatable tube has a wall thickness of less than about 0.5 mm, wherein the inner longitudinal chamber alone has an air permeability of less than about 1 cfm, wherein the outer longitudinal textile chamber alone has an air permeability of greater than about 100 cfm, and the outer longitudinal textile chamber together with the inner longitudinal chamber located inside the outer longitudinal textile chamber has an air permeability of less than about 1 cfm.