US4867527A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined electrical power and optical fiber cable
Assignee: Prysmian Cavi e Sistemi Energia SRL
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Filing: 1988-03-24
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Granted: 1989-09-19
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Expires: 2008-03-24
Abstract
Abstract A cable for conveying both electrical power and optical signals, the cable having an electric conductor with insulation therearound, a sheath around the insulation, a one or two part protective layer around the insulation, a tube within the protective layer and at least one optical fiber loosely received in the tube. The protective layer can have armoring therearound and in this case, the radial thickness of the protective layer is from two to four times the diameter of the tube.
Inventors
- 👤 Enrico Dotti
- 👤 Giorgio Grasso
- 👤 Gianmario Lanfranconi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:59
CPC Classifications
H; H01; H01B; H01B9/00; H01B9/005; G; G02; G02B; G02B6/00; G02B6/44; G02B6/4401; G02B6/4415; G02B6/4416
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
62 words
A cable for conveying electric power and for transmitting optical signals which comprises at least an electric conductor, insulation surrounding the conductor, a metal sheath around said insulation and a protective layer around said metal sheath, the improvement comprising at least one duct within said protective layer and extending longitudinally of said cable and at least one optical fiber within said duct.
Claim 2
Dependent Claim
62 words
A cable for conveying electric power and for transmitting optical signals which comprises at least an electric conductor, insulation surrounding the conductor, a metal sheath around said insulation and a protective layer around said metal sheath, the improvement comprising at least one duct within said protective layer and extending longitudinally of said cable and at least one optical fiber within said duct.
Claim 3
Dependent Claim
30 words
A cable as set forth in claim 1 wherein said protective layer is made of extruded polymeric material and wherein said duct is a tube embedded in said protective layer.
Claim 4
Dependent Claim
17 words
A cable as set forth in claim 2 wherein said tube is a tube of stainless steel.
Claim 5
Dependent Claim
17 words
A cable as set forth in claim 2 wherein said tube is a tube of plastic material.
Claim 6
Dependent Claim
37 words
A cable as set forth in claim 2 wherein said tube is a tube of a metal alloy having a Young's modulus of elasticity of at least 19,000 Kg/mm 2 and a yield elastic limit of 0.8.
Claim 7
Dependent Claim
18 words
A cable as set forth in claim 1 wherein said optical fiber is loosely received in said duct.
Claim 8
Dependent Claim
78 words
A cable for conveying electric power and for transmitting optical signals which comprises at least an electric conductor, insulation surrounding the conductor, a sheath around said insulation, a protective layer around said sheath, said protective layer comprising a radially innermost winding of plastic tape and a radially outermost layer of extruded polymeric material, at least one duct within said winding of plastic tape and extending longitudinally of said cable and at least one optical fiber within said duct.
Claim 9
Dependent Claim
78 words
A cable for conveying electric power and for transmitting optical signals which comprises at least an electric conductor, insulation surrounding the conductor, a sheath around said insulation, a protective layer around said sheath, said protective layer comprising a radially innermost winding of plastic tape and a radially outermost layer of extruded polymeric material, at least one duct within said winding of plastic tape and extending longitudinally of said cable and at least one optical fiber within said duct.
Claim 10
Dependent Claim
85 words
A cable for conveying electric power and for transmitting optical signals which comprises at least one electrical conductor, insulation surrounding the conductor, a sheath around said insulation, a protective layer around said sheath, said protective layer comprising a radially inner layer of extruded polymeric material and a radially outer winding of protective material, at least one duct extending longitudinally of said cable and disposed in said radially inner layer, at least one optical fiber within said duct, and an external armour around said protective layer.
Claim 11
Dependent Claim
85 words
A cable for conveying electric power and for transmitting optical signals which comprises at least one electrical conductor, insulation surrounding the conductor, a sheath around said insulation, a protective layer around said sheath, said protective layer comprising a radially inner layer of extruded polymeric material and a radially outer winding of protective material, at least one duct extending longitudinally of said cable and disposed in said radially inner layer, at least one optical fiber within said duct, and an external armour around said protective layer.
Claim 12
Dependent Claim
20 words
A cable as set forth in claim 8 wherein said duct is a tube embedded in said radially inner layer.
Claim 13
Dependent Claim
30 words
A cable as set forth in claim 8 wherein at least one further said duct is disposed in said radially outer layer and has at least one optical fiber therein.
Claim 14
Dependent Claim
20 words
A cable as set forth in claim 10 wherein said duct is a tube embedded in said radially outer layer.
Claim 15
Dependent Claim
89 words
A cable for conveying electric power and for transmitting optical signals which comprises at least one electrical conductor, insulation surrounding the conductor, a sheath around said insulation, a protective layer around said sheath, said protective layer comprising a radially inner layer of extruded polymeric material and a radially outer layer of a winding of a protective material, at least one duct extending longitudinally of said cable and disposed in said radially outer layer, at least one optical fiber within said duct, and an external armour around said protective layer.
Claim 16
Dependent Claim
89 words
A cable for conveying electric power and for transmitting optical signals which comprises at least one electrical conductor, insulation surrounding the conductor, a sheath around said insulation, a protective layer around said sheath, said protective layer comprising a radially inner layer of extruded polymeric material and a radially outer layer of a winding of a protective material, at least one duct extending longitudinally of said cable and disposed in said radially outer layer, at least one optical fiber within said duct, and an external armour around said protective layer.
Claim 17
Dependent Claim
20 words
A cable as set forth in claim 12 wherein said duct is a tube embedded in said radially outer layer.
Claim 18
Dependent Claim
31 words
A cable as set forth in claim 12 wherein said radially outer layer has a radial thickness from about two to about four times the external cross-sectional dimension of said duct.
Claim 19
Dependent Claim
21 words
A cable as set forth in claim 14 wherein said duct is a tube embedded in said winding of plastic tape.
Claim 20
Dependent Claim
26 words
A cable as set forth in claim 12 wherein said external armor is a plurality of mechanically resistant, elongated elements having circular cross-section and disposed side-by-side.
Claim 21
Dependent Claim
47 words
A cable as set forth in claim 16 wherein said mechanically resistant elongated elements are in contact and wherein said duct is disposed with its axis lying substantially on a radius of the cable passing through the tangent point of two of said mechanically resistant elongated elements.
Claim 22
Dependent Claim
42 words
A cable as set forth in claim 17 wherein said mechanically resistant, elongated elements are helically wound and said duct follows a helical path with a helical pitch which is substantially equal to the helical pitch of said mechanically resistant, elongated elements.
Claim 23
Dependent Claim
30 words
A cable as set forth in claim 16 wherein said radially outer layer has a thickness from about two to about three times the external cross-sectional dimension of said duct.
Claim 24
Dependent Claim
27 words
A cable as set forth in claim 12 wherein said external armor is a plurality of mechanically resistant, elongated elements having a non-circular cross-section and disposed side-by-side.
References Cited (Backward Citations)
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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) | 1992-09-18 | 1993-03-20 | 1993-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-18 | 1997-03-20 | 1997-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-18 | 2001-03-20 | 2001-09-19 | $7700.00 | Window Closed / Lapsed |