EP0284900A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Optical fiber building cables
Assignee: AT&T Inc
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Filing: 1988-03-17
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Granted: —
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Expires: 2008-03-17
Abstract
Abstract A flame and smoke resistant optical fiber cable (20) having a relatively small diameter includes a core comprising a ribbon array or a plurality of individual fibers and a sheath system. The sheath system includes an impregnated fiberglass tape (35) which has been wrapped about the core. The tape is impregnated with a solution system which comprises a micaceous constituent, a fluoropolymer constituent and a lubricant such as silicone. The impregnated system provides the tape and hence the cable with unexpectedly superior fire retardant and smoke resistance properties so that the cable is suitable for plenum and riser use. Advantageously, the thickness of the tape impregnated with such a system is relatively thin which is helpful in maintaining a relatively small diameter for the cable. An all dielectric strength member system is disposed between the tape and a plastic jacket (37).
Inventors
- 👤 Candido John Arroyo
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 21:38
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/44; G02B6/4401; G02B6/4429; G02B6/4436; G02B6/443; G02B6/4431
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
57 words
An optical fiber cable, which comprises an optical fiber core and a plastic jacket, said cable being CHARACTERIZED IN THAT a core wrap comprising a fiberglass tape which after having been impregnated with a fire-retardant material which includes a composition comprising a micaceous constituent has been wrapped about said core to protect said core against thermal decomposition.
Claim 2
Dependent Claim
57 words
An optical fiber cable, which comprises an optical fiber core and a plastic jacket, said cable being CHARACTERIZED IN THAT a core wrap comprising a fiberglass tape which after having been impregnated with a fire-retardant material which includes a composition comprising a micaceous constituent has been wrapped about said core to protect said core against thermal decomposition.
Claim 3
Dependent Claim
23 words
The optical fiber cable of claim 1, wherein the core wrap tape is impregnated with a composition which also includes a silicone material.
Claim 4
Dependent Claim
25 words
The optical fiber cable of claim 1, wherein said core wrap is impregnated with a composition comprising a micaceous constituent, a fluoropolymer constituent and silicone.
Claim 5
Dependent Claim
37 words
The optical fiber cable of claim 3, wherein said composition comprises about 12 to 25 percent by weight of polytetrafluoroethylene, about 50 to 62% by weight of mica and about 25 to 37% by weight of silicone.
Claim 6
Dependent Claim
13 words
The optical fiber cable of claim 3, wherein said micaceous constituent is phlogopite.
Claim 7
Dependent Claim
117 words
The optical fiber cable of claim 1 which also comprises a tubular member, which is disposed between said core and said core wrap and which is made of a plastic material, and further comprises a strength member system which is interposed between said core wrap and said jacket and which comprises strength members made of a dielectric material with a first plurality of said strength members being relatively flexible and with a second plurality thereof having sufficient compressive stiffness and being coupled sufficiently to said jacket to provide a composite which is effective to inhibit contraction of said cable, said first and second pluralities of strength members cooperating to provide said cable with a predetermined tensile stiffness.
Claim 8
Dependent Claim
30 words
The optical fiber cable of claim 6, wherein each of said relatively flexible strength members comprises a glass roving having a tensile stiffness of about 392 lbs. per 1% strain.
Claim 9
Dependent Claim
75 words
The optical fiber cable of claim 6, wherein said strength member system being disposed in an inner layer and an outer layer each, of said strength members of said inner layer comprising a glass fiber roving which has been impregnated with a polyurethane material and wherein a plurality of the strength members of said outer layer are relatively inflexible and rod-like and made of a glass material which has been impregnated with an epoxy material.
Claim 10
Dependent Claim
23 words
The optical fiber cable of claim 8, wherein each said strength member of said inner layer is wrapped helically about said tubular member.
Claim 11
Dependent Claim
27 words
The optical fiber cable of claim 8, wherein each of said strength members of said outer layer is wrapped helically about said inner layer of strength members.
Claim 12
Dependent Claim
23 words
The optical fiber cable of claim 8, wherein said inner and outer layers are wrapped helically about said tubular member in opposite directions.
Claim 13
Dependent Claim
24 words
The optical fiber cable of claim 8, wherein each of said strength members is caused to be disposed about said core without intended stranding.
References Cited (Backward Citations)
No citation records indexed.
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