Patent ID: 6845789
Filing Date: 2005-01-25
Classification: F16L,G02B,H02G

Abstract:
1. An inner duct having a central passage operable for routing a transmission cable therein, said inner duct comprising: a duct tube, said duct tube being monolithic and having an inner surface and an outer surface defining a duct tube wall therebetween, said inner surface defining the central passage, the central passage being sized for installing and removing the transmission cable, wherein an average outer diameter of the duct tube is about 38 millimeters (1.5 inches) or less so that the inner duct is suitable for routing a plurality of inner ducts within a larger duct; at least one passageway, said passageway disposed generally between said inner surface of said duct tube and said outer surface of said duct tube so that the at least one passageway is disposed within the duct tube wall, wherein said passageway is operable for receiving at least one optical fiber.