Patent US4389088A successfully refreshed from Google Patents.
US4389088A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Underwater optical fibre cable
Assignee: Cables de Lyon SA
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Filing: 1980-06-27
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Granted: 1983-06-21
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Expires: 2000-06-27
Abstract
Abstract An underwater optical fibre cable, including a central filament (1) whose lateral surface is provided with helical grooves (3) in each of which at least one optical fibre (4) can be placed, characterized in that the transversal cross-section and dimensions of said grooves enable then to provide a degree of freedom for said fibre in the order of at least half of its transversal dimension and within said groove, further said central filament being made of at least one metal or alloy.
Inventors
- 👤 Jean-Pierre Trezequet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:01
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/44; G02B6/4401; G02B6/4415; G02B6/4427; G02B6/4407; G02B6/4479; G02B6/4486; G02B6/4488
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
96 words
An underwater optical fibre cable including a central filament provided with helical grooves for receiving at least one optical fibre in each groove, the improvement wherein the groove cross-section is such that an optical fibre therein can move transversally by at least half of its transversal dimension, said central filament being made of a metal or a metal alloy, and wherein said central filament is covered successively by a first metal tube surrounding and contacting said metal or metal alloy central filament, an insulating covering and a layer of metal wires wound helically in contiguous turns.
Claim 2
Dependent Claim
96 words
An underwater optical fibre cable including a central filament provided with helical grooves for receiving at least one optical fibre in each groove, the improvement wherein the groove cross-section is such that an optical fibre therein can move transversally by at least half of its transversal dimension, said central filament being made of a metal or a metal alloy, and wherein said central filament is covered successively by a first metal tube surrounding and contacting said metal or metal alloy central filament, an insulating covering and a layer of metal wires wound helically in contiguous turns.
Claim 3
Dependent Claim
94 words
An underwater optical fibre cable including a central filament provided with helical grooves for receiving at least one optical fibre in each groove, the improvement wherein the groove cross-section is such that an optical fibre therein can move transversally by at least half of its transversal dimension, said central filament being made of a metal or a metal alloy, and wherein said central filament is covered successively by a first metal tube, an insulating covering, a layer of metal wires wound helically in contiguous turns, a second metal tube and a second insulating covering.
Claim 4
Dependent Claim
94 words
An underwater optical fibre cable including a central filament provided with helical grooves for receiving at least one optical fibre in each groove, the improvement wherein the groove cross-section is such that an optical fibre therein can move transversally by at least half of its transversal dimension, said central filament being made of a metal or a metal alloy, and wherein said central filament is covered successively by a first metal tube, an insulating covering, a layer of metal wires wound helically in contiguous turns, a second metal tube and a second insulating covering.
Claim 5
Dependent Claim
24 words
An underwater cable according to claim 2, wherein the winding pitch of said metal wires is shorter than the pitch of the helical grooves.
Claim 6
Dependent Claim
80 words
An underwater optical fibre cable including a central filament provided with helical grooves for receiving at least one optical fibre in each groove, the improvement wherein the groove cross-section is such that an optical fibre therein can move transversally by at least half of its transversal dimension, said central filament being made of a metal or a metal alloy, and wherein the space of said grooves which is not occupied by the optical fibre is filled with a water-repellent liquid.
Claim 7
Dependent Claim
80 words
An underwater optical fibre cable including a central filament provided with helical grooves for receiving at least one optical fibre in each groove, the improvement wherein the groove cross-section is such that an optical fibre therein can move transversally by at least half of its transversal dimension, said central filament being made of a metal or a metal alloy, and wherein the space of said grooves which is not occupied by the optical fibre is filled with a water-repellent liquid.
Claim 8
Dependent Claim
19 words
An underwater cable according to claim 4, wherein sealing plugs are disposed at intervals and longitudinally in said grooves.
Claim 9
Dependent Claim
72 words
An underwater optical fibre cable including a central filament provided with helical grooves for receiving at least one optical fibre in each groove, the improvement wherein the groove cross-section is such that an optical fibre therein can move transversally by at least half of its transversal dimension, said central filament being made of a metal or a metal alloy, and wherein sealing plugs are disposed at intervals and longitudinally in said grooves.
Claim 10
Dependent Claim
72 words
An underwater optical fibre cable including a central filament provided with helical grooves for receiving at least one optical fibre in each groove, the improvement wherein the groove cross-section is such that an optical fibre therein can move transversally by at least half of its transversal dimension, said central filament being made of a metal or a metal alloy, and wherein sealing plugs are disposed at intervals and longitudinally in said grooves.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-06-20 | 1986-12-20 | 1987-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-20 | 1990-12-20 | 1991-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-20 | 1994-12-20 | 1995-06-21 | $7700.00 | Window Closed / Lapsed |