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US 7,136,556 B2Granted
Signal transmitting cable
AssigneeEmtelle UK Limited
InventorsGeorge Henry Platt Brown, David John Stockton, Greig Iain McIlwraith
Life of this patent
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AssigneeEmtelle UK Limited
InventorsGeorge Henry Platt Brown, David John Stockton, Greig Iain McIlwraith
Estimating the term…
A fibre optic cable includes a core of primary coated optical fibres embedded in an inner layer of acrylate material, having sufficient tensile strength when cured to lock at least the outermost fibres in place and still allow the fibres to be easily broken out of the assembly for termination and splicing purposes. The hardness of the acrylate layer is such that at least the outermost fibres of the bundle are restricted from moving axially relative to the inner layer. The inner layer is then surrounded by a loose thin jacket formed from a mixture of high density polyethylene having a Shore hardness greater than or equal to 60 and a generally uniformly distributed slip agent, including a polyether modified poly (dimethylsiloxane) material such as polyether modified hydroxy functional poly (dimethylsiloxane) material. The mixture from which the outer layer is formed is compacted by means of heat and pressure. The outer layer may also contain a mineral filler, such as calcium carbonate and/or titanium dioxide, in order to improve the stability of the dimensions of the outer layer as the temperature changes.
A cable assembly, comprising a plurality of flexible signal transmitting members surrounded by a first layer, wherein axial movement of at least the outermost of said signal transmitting members relative to said first layer is restricted, and further comprising a continuous thermoplastic polymer outermost layer arranged outwardly of said first layer, wherein the hardness of the polymer of said outermost layer is greater than or equal to a Shore D hardness of 60.
A cable assembly, comprising a plurality of flexible signal transmitting members arranged such that neighboring signal transmitting members are in touching contact with each other, said signal transmitting members being surrounded by a first layer, wherein axial movement of at least the outermost of said signal transmitting members relative to said first layer is substantially prevented, and further comprising a continuous thermoplastic polymer second layer arranged outwardly of said first layer, said second layer having a thickness of less than 400 microns around at least 10% of the circumference of said cable assembly.
A cable assembly, comprising a plurality of flexible signal transmitting members surrounded by a first layer such that axial movement of at least the outermost signal transmitting members relative to said first layer is restricted, and further comprising a continuous thermoplastic polymer second layer arranged outwardly of said first layer and adapted to be removed from said first layer by sliding over said first layer.
Dependencies are inferred from the claim text.