US3878485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmission line for TDM communication system
Assignee: Italtel SpA
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Filing: 1973-06-13
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Granted: 1975-04-15
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Expires: 1993-06-13
Abstract
Abstract In order to suppress cross-talk between channels using adjoining time slots in a time-division-multiplex (TDM) communication system, the message signals are carried by a transmission line with two conductors, of a maximum effective thickness on the order of magnitude of the penetration depth delta of the current, separated by a layer of a substantially nonpolarizable dielectric material such as polyethylene or Teflon. The conductors may be parallel strips or coaxial; in the latter case, either or both could be a solid foil of the specified thickness or could be composed of one or more litz wires whose strands have that thickness.
Inventors
- 👤 Paolo Erculiani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:53
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/10; H01; H01P; H01P3/00; H01P3/02; H04B; H04B3/00; H04B3/52; H01B; H01B11/00; H01B11/18; H01B11/1808
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
102 words
A transmission line for a time-division-multiplex communication system, comprising elongate first conductor means, elongate second conductor means spacedly juxtaposed with said first conductor means, and insulating means of a substantially nonpolarizable dielectric material, the effective thickness of said first and second conductor means in a common transverse plane being at most on the order of magnitude of the penetration depth of an alternating current at a frequency in the KHz range, said conductor means forming a closed loop with a multiplicity of junctions to respective branch lines at spaced-apart locations, said loop forming two parallel paths between any two of said junctions.
Claim 2
Dependent Claim
102 words
A transmission line for a time-division-multiplex communication system, comprising elongate first conductor means, elongate second conductor means spacedly juxtaposed with said first conductor means, and insulating means of a substantially nonpolarizable dielectric material, the effective thickness of said first and second conductor means in a common transverse plane being at most on the order of magnitude of the penetration depth of an alternating current at a frequency in the KHz range, said conductor means forming a closed loop with a multiplicity of junctions to respective branch lines at spaced-apart locations, said loop forming two parallel paths between any two of said junctions.
Claim 3
Dependent Claim
27 words
A transmission line as defined in claim 1 wherein said insulation means is a solid layer completely occupying the space between said first and second conductor means.
Claim 4
Dependent Claim
120 words
A transmission line for a time-division-multiplex communication system, comprising an elongate inner conductor, a tubular outer conductor coaxial with said inner conductor spacedly surrounding same, a solid insulating layer of a substantially nonpolarizable dielectric material completely occupying the space between said conductors, the effective thickness of said conductors in a common plane transverse to said layer being at most on the order of magnitude of the penetration depth of an alternating current at a frequency in the KHz range, said insulating layer being provided with a radial bore extending to said inner conductor, and a branch lead terminating in a plug seated in said bore in conductive contact with said inner conductor, said outer conductor being spaced from said plug.
Claim 5
Dependent Claim
120 words
A transmission line for a time-division-multiplex communication system, comprising an elongate inner conductor, a tubular outer conductor coaxial with said inner conductor spacedly surrounding same, a solid insulating layer of a substantially nonpolarizable dielectric material completely occupying the space between said conductors, the effective thickness of said conductors in a common plane transverse to said layer being at most on the order of magnitude of the penetration depth of an alternating current at a frequency in the KHz range, said insulating layer being provided with a radial bore extending to said inner conductor, and a branch lead terminating in a plug seated in said bore in conductive contact with said inner conductor, said outer conductor being spaced from said plug.
Claim 6
Dependent Claim
17 words
A transmission line as defined in claim 3 wherein said effective thickneSs is less than 0.1 mm.
Claim 7
Dependent Claim
20 words
A transmission line as defined in claim 3 wherein said dielectric material is a polymer with a linear carbon chain.
Claim 8
Dependent Claim
15 words
A transmission line as defined in claim 5 wherein said polymer is polyethylene or polytetrafluoroethylene.
Claim 9
Dependent Claim
27 words
A transmission line as defined in claim 3 wherein said inner conductor forms a coating on said insulating layer extending over the peripheral wall of said bore.
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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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |