Patent US4257675A successfully refreshed from Google Patents.
US4257675A
Expired / Lapsed
US
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Optical-fiber submarine cable and manufacturing method thereof
Assignee: KDDI Corp
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Filing: 1979-03-20
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Granted: 1981-03-24
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Expires: 1999-03-20
Abstract
Abstract An optical-fiber submarine cable, in which a combination is provided by a thin, cylindrical pressure resisting sheath, and a reinforcing member of a cross section inserted by the thin, cylindrical pressure resisting sheath so as to divide the circular cross section of the pressure resisting sheath into a plurality of spaces and to have a required withstand pressure; and in which at least one low-loss optical fiber is inserted in each of the plurality of spaces. The combination can be fabricated by separately paying out the reinforcing member and the thin, cylindrical pressure resisting sheath, or by curving inwardly a sheet of tape being paid out.
Inventors
- 👤 Yukio Nakagome
- 👤 Yasuhiko Niiro
- 👤 Hiroharu Wakabayashi
- 👤 Makoto Nunokawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:31
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/151; B21C37/08; B21C37/0803; G; G02; G02B; G02B6/00; G02B6/44; G02B6/4401; G02B6/4407; G02B6/4415; G02B6/4427; G02B6/4479; G02B6/4486; G02B6/4488; G02B6/4489; G02B6/449; G02B6/4491
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
124 words
An optical-fiber submarine cable comprising: a combination body formed, as one body, from a sheet-like tape into a cylindrical-pressure resisting sheath and a reinforcing member of a cross section extending longitudinally in the cylindrical pressure-resisting sheath by curving inwardly both marginal longitudinal edge portions of the sheet-like tape, said reinforcing member having a cross section composed of at least three radial portions extending radially from the center thereof in the cylindrical pressure resisting sheath so as to provide at least three longitudinally extending spaces separated by said at least three portions, the marginal longitudinal edge portions of the cylindrical pressure resisting sheath being joined together, and at least one low-loss optical fiber extending longitudinally in each of said at least three longitudinally extending spaces.
Claim 2
Dependent Claim
124 words
An optical-fiber submarine cable comprising: a combination body formed, as one body, from a sheet-like tape into a cylindrical-pressure resisting sheath and a reinforcing member of a cross section extending longitudinally in the cylindrical pressure-resisting sheath by curving inwardly both marginal longitudinal edge portions of the sheet-like tape, said reinforcing member having a cross section composed of at least three radial portions extending radially from the center thereof in the cylindrical pressure resisting sheath so as to provide at least three longitudinally extending spaces separated by said at least three portions, the marginal longitudinal edge portions of the cylindrical pressure resisting sheath being joined together, and at least one low-loss optical fiber extending longitudinally in each of said at least three longitudinally extending spaces.
Claim 3
Independent Claim
139 words
A method for the manufacturing of an optical-fiber submarine cable comprising the steps of: curving inwardly both marginal longitudinal edge portions of a sheet-like tape being paid out longitudinally and forming, as one body, a cylindrical outer sheath about a longitudinally elongated reinforcing member having a cross section composed of at least three portions extending radially from the center thereof in the outer sheath, at the same time paying out longitudinally a required number of optical fibers in position to extend along the reinforcing member disposed in respective spaces separated by said at least three radially extending portions; and joining the longitudinal edge portions of the outer sheet-like tape to form the sheath in a state wherein a desired number of optical fibers are housed in the sheath each in a respective one of said at least three spaces.
Claim 4
Independent Claim
139 words
A method for the manufacturing of an optical-fiber submarine cable comprising the steps of: curving inwardly both marginal longitudinal edge portions of a sheet-like tape being paid out longitudinally and forming, as one body, a cylindrical outer sheath about a longitudinally elongated reinforcing member having a cross section composed of at least three portions extending radially from the center thereof in the outer sheath, at the same time paying out longitudinally a required number of optical fibers in position to extend along the reinforcing member disposed in respective spaces separated by said at least three radially extending portions; and joining the longitudinal edge portions of the outer sheet-like tape to form the sheath in a state wherein a desired number of optical fibers are housed in the sheath each in a respective one of said at least three spaces.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-23 | 1984-09-22 | 1985-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-23 | 1988-09-22 | 1989-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-23 | 1992-09-22 | 1993-03-24 | $7700.00 | Window Closed / Lapsed |