Patent US4830860A successfully refreshed from Google Patents.
US3789129A
Expired / Lapsed
US
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Air-insulated coaxial high-frequency cable
Assignee: Felten and Guilleaume AG
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Filing: 1973-06-04
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Granted: 1974-01-29
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Expires: 1993-06-04
Abstract
Abstract A tubular inner conductor has a first diameter and is provided with annular corrugations adjacent ones of which are spaced from each other by a distance smaller than 0.3 times the first diameter. A coaxial tubular outer conductor surrounds the inner conductor and defines therewith a clearance. The outer conductor is provided with helical corrugations and has a larger second diameter. Spacers are located in the clearance and engage the corrugations of the inner and outer conductors. Adjacent ones of these spacers are spaced axially of the conductors by a distance which is equal to between 0.6 and 0.75 times the sum of the first and second diameters.
Inventors
- 👤 H Ditscheid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:24
CPC Classifications
H; H01; H01P; H01P3/00; H01B; H01B11/00; H01B11/18; H01B11/1808; H01B11/1834; H01B11/1856
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
112 words
An air insulated coaxial high-frequency cable, comprising a tubular inner conductor having a first diameter and provided with annular corrugations adjacent ones of which are spaced from each other by a distance smaller than 0.3 times said first diameter; a coaxial tubular outer conductor surrounding said inner conductor and defining therewith a clearance, said outer conductor being provided with helical corrugations and having a larger second diameter; and spacers located in said clearance and engaging the corrugations of said inner and outer conductors, adjacent ones of said spacers being spaced coaxially of said conductors by a distance equal to between 0.6 and 0.75 times the sum of said first and second diameters.
Claim 2
Dependent Claim
112 words
An air insulated coaxial high-frequency cable, comprising a tubular inner conductor having a first diameter and provided with annular corrugations adjacent ones of which are spaced from each other by a distance smaller than 0.3 times said first diameter; a coaxial tubular outer conductor surrounding said inner conductor and defining therewith a clearance, said outer conductor being provided with helical corrugations and having a larger second diameter; and spacers located in said clearance and engaging the corrugations of said inner and outer conductors, adjacent ones of said spacers being spaced coaxially of said conductors by a distance equal to between 0.6 and 0.75 times the sum of said first and second diameters.
Claim 3
Dependent Claim
15 words
A cable as defined in claim 1, wherein said spacers are of synthetic plastic material.
Claim 4
Dependent Claim
105 words
A cable as defined in claim 1, wherein said spacers each comprise a plurality of spacing portions extending radially across said clearance and being of substantially H-shaped cross-section, each of said spacing portions having a radially outer periphery provided with a pair of axially extending ribs which engage respective corrugations of said outer conductor, and a radially inner periphery including a part-circular support portion Which engages said inner conductor and embraces the same over substantially 30*-50* of arc, said support portion extending in axial direction by a distance corresponding to between 1.0 and 1.8 times the center-to-center spacing between consecutive ones of said annular corrugations.
Claim 5
Dependent Claim
45 words
A cable as defined in claim 1, wherein said spacers each comprise a plurality of circumferentially offset spacing portions, and circumferentially extending springy portions connecting respective ones of said spacing portions, said springy portions being of substantially H-shaped cross-section and forming a circumferentially incomplete annulus.
Claim 6
Dependent Claim
35 words
A cable as defined in claim 1; and further comprising a marking provided in the cross-sectional plane of symmetry of the respective spacer for facilitating positioning of the latter with reference to said inner conductor.
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) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |