US3717719A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coaxial cable inner conductor
Assignee: International Standard Electric Corp
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Filing: 1971-11-17
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Granted: 1973-02-20
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Expires: 1991-11-17
Abstract
Abstract A laminate structure for the inner conductor of a coaxial cable includes a thin outer copper layer and an inner aluminum layer over a central core. The outer layer is used for signal transmission and the inner layer for direct current, with adhesives bonding the layers together and to the core. A dielectric layer and outer conductor and sheath are added to complete the cable structure. Use of copper in the inner conductor is reduced without increasing high frequency attenuation and direct current resistance.
Inventors
- 👤 C Smith
- 👤 N Bliss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:11
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/14; H01B11/00; H01B11/18; H01B11/1808; H01B11/1826
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
131 words
A cable comprising a central strength member core and an inner conductor tape longitudinally wrapped around said core, said inner conductor tape including a laminate of a first outer metal layer, a second inner metal layer and an adhesive layer between said first and second layers, said first outer metal layer being of a material of lower resistivity than said second inner metal layer and being adapted for signal transmission, said first outer metal layer being of a minimum thickness in accordance with the minimum operating frequency of the cable, said second inner metal layer being adapted for direct current power transmission and being of a thickness in accordance with a predetermined voltage drop between intervals along the length of the cable and being bonded to said core for interlayer strength.
Claim 2
Dependent Claim
131 words
A cable comprising a central strength member core and an inner conductor tape longitudinally wrapped around said core, said inner conductor tape including a laminate of a first outer metal layer, a second inner metal layer and an adhesive layer between said first and second layers, said first outer metal layer being of a material of lower resistivity than said second inner metal layer and being adapted for signal transmission, said first outer metal layer being of a minimum thickness in accordance with the minimum operating frequency of the cable, said second inner metal layer being adapted for direct current power transmission and being of a thickness in accordance with a predetermined voltage drop between intervals along the length of the cable and being bonded to said core for interlayer strength.
Claim 3
Dependent Claim
25 words
The cable as claimed in claim 1, wherein the first outer metal layer is of copper and the second inner metal layer is of aluminum.
Claim 4
Dependent Claim
20 words
The cable as claimed in claim 2, wherein said laminate is wrapped around the core with the longitudinal edges overlapping.
Claim 5
Dependent Claim
20 words
The cable as claimed in claim 2, wherein said laminate is wrapped around the core with its longitudinal edges abutting.
Claim 6
Dependent Claim
24 words
The cable as claimed in claim 2, including an adhesive layer bonding said second metal layer to said core, said core being of metal.
Claim 7
Dependent Claim
15 words
The cable as claimed in claim 5, wherein said adhesive layer is of epoxy resin.
References Cited (Backward Citations)
FR1140207A
Cited
US3360409A
Cited
BE644973A
Cited
US3315025A
Cited
US3402254A
Cited
FR2011085A1
Cited
US3602633A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |