Patent ID: 9459423
Filing Date: 2016-10-04
CPC Classification: G02B

Claim Text:
1. A fire-resistant optical communication cable comprising: an elongate cable body including an inner surface defining a passage in the elongate cable body and an outer surface; a plurality of elongate optical transmission elements located within the passage of the elongate cable body; and a layer of intumescent particles bonded to and at least partially embedded in material of the elongate cable body, the layer of intumescent particles at least partially defining the inner surface of the elongate cable body and extending radially from the inner surface of the elongate cable body at least a portion of the distance from the inner surface to the outer surface of the elongate cable body such that the layer of intumescent particles surrounds the plurality of elongate optical transmission elements and is located between the plurality of elongate optical transmission elements and the outer surface of the elongate cable body, wherein intumescent particles of the layer of intumescent particles expand and form char upon exposure to fire, filling interstitial spaces within the passage thereby at least partially choking off flow of smoke and superheated gases through the passage; and an elongate fiber located within the passage of the elongate cable body, the elongate fiber including an outer flame resistant coating, wherein upon exposure to heat the flame resistant coating forms a ceramic layer increasing the combustion time of the elongate fiber.