Patent US4354732A successfully refreshed from Google Patents.
US4354732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cable elements comprising optical fibres and cables incorporating them
Assignee: LIG+NES TELEGRAPHIQUES ET TELEPHONIQUES A JOINT STOCK Co OF FRANCE Ste
•
Filing: 1979-03-07
•
Granted: 1982-10-19
•
Expires: 1999-03-07
Abstract
Abstract A transmission cable using optical fibre for conveying the information consists of fibres loosely laid in helical grooves of a core so that the fibre will undulate within the groove due to over-length given by pretwisting of the fibre and curvature of the groove flanks. Reduction of the contact surface between the fibre and the core improves the electrical characteristics and reduces the sensitivity of the cable to mechanical stress.
Inventors
- 👤 Maurice Arnaud, deceased
- 👤 heir by Marie C. N. A. Avril nee Arnaud
- 👤 heir by Michel F. Arnaud
- 👤 Bernard Chiron
- 👤 Claude Gallachi
- 👤 Jean-Pierre Hulin
- 👤 Michel DE Vecchis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:29
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/44; G02B6/4401; G02B6/441; G02B6/4407; G02B6/4415; G02B6/4416; G02B6/4479; G02B6/4489; G02B6/449; G02B6/4491
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
87 words
An optical fibre cable element comprising a mechanical core; a cylindrical sheath surrounding the core and containing helical grooves of V-shape in cross section in its surface, each groove being bounded by a pair of flanks which are curved convexly toward the interior of the groove over only portions of their lengths; a single undulating optical fibre in each groove resting alternately on the curved portions of the flanks and held thereby spaced from the bottom of the groove; and at least one taping around the sheath.
Claim 2
Dependent Claim
87 words
An optical fibre cable element comprising a mechanical core; a cylindrical sheath surrounding the core and containing helical grooves of V-shape in cross section in its surface, each groove being bounded by a pair of flanks which are curved convexly toward the interior of the groove over only portions of their lengths; a single undulating optical fibre in each groove resting alternately on the curved portions of the flanks and held thereby spaced from the bottom of the groove; and at least one taping around the sheath.
Claim 3
Dependent Claim
21 words
A cable element as defined in claim 1 in which each fibre is laid in its groove in a twisted condition.
Claim 4
Dependent Claim
27 words
A cable element as defined in claim 1 in which the angle between the flanks at the apex of each groove is not greater than 60 degrees.
Claim 5
Dependent Claim
26 words
A cable element as defined in claim 1 in which the depth of the grooves is between three and five times the diameter of the fibres.
Claim 6
Dependent Claim
32 words
A cable element as defined in claim 1 in which the sheath includes a pair of notches which are located on different diameters and serve to mark the locations of the fibres.
References Cited (Backward Citations)
US3887265A
Cited
US4199224A
Cited
DE2507648A1
Cited
DE2509547A1
Cited
DE2511019A1
Cited
DE2519050A1
Cited
FR2312788A1
Cited
US4166670A
Cited
US4235511A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-18 | 1986-04-19 | 1986-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-18 | 1990-04-19 | 1990-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-18 | 1994-04-19 | 1994-10-19 | $7700.00 | Window Closed / Lapsed |