Patent US3706838A successfully refreshed from Google Patents.
US3706838A
Expired / Lapsed
US
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Telecommunication cables
Assignee: Balfour Beatty PLC
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Filing: 1970-11-20
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Granted: 1972-12-19
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Expires: 1990-11-20
Abstract
Abstract A telecommunication cable comprises at least two cable units laid up together and enclosed in a water-proof sheath. Each cable unit comprises a multiplicity of conductors each having a dielectric of cellular plastics material, at least one layer of insulating tape, for instance paper, surrounding the multiplicity of conductors and, filling the interstices within the cable unit, a water-impermeable medium, for instance petroleum jelly, which will not drain under the influence of gravity or such hydrostatic pressure as may arise in the event of damage to the cable sheath but which will permit relative sliding movement of the cellular plastics insulated conductors over one another during such bending of the cable as occurs during manufacture and installation of the cable. The or each layer of insulating tape is impregnated with the water-impermeable medium and constitute a barrier to the ingress of water.
Inventors
- 👤 David Luard Boult
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:58
CPC Classifications
H; H01; H01B; H01B13/00; H01B13/02; H01B11/00; H01B13/22; H01B7/00; H01B7/17; H01B7/28; H01B7/282; H01B7/285; H01B7/2855
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
15 words
A telecommunication cable as claimed in claim 1, wherein the insulating tape is of paper.
Claim 2
Dependent Claim
27 words
A telecommunication cable as claimed in claim 2, wherein the paper is an extensible Kraft paper having an extensibility in the region of 7 to 8 percent.
Claim 3
Dependent Claim
14 words
A telecommunication cable as claimed in claim 1, wherein the conductors are of aluminum.
Claim 4
Dependent Claim
18 words
A telecommunication cable as claimed in claim 1, wherein the dielectric of the conductors is of cellular polythene.
Claim 5
Dependent Claim
15 words
A telecommunication cable as claimed in claim 1, wherein the water-impermeable medium is petroleum jelly.
Claim 6
Dependent Claim
172 words
A telecommunication cable comprising at least two cable units laid up together and enclosed in a water-proof sheath, eAch cable unit comprising a multiplicity of conductors each having a dielectric of plastics material of cellular form, at least one layer of insulating tape surrounding the multiplicity of conductors, the layer comprising a tape applied longitudinally to and folded transversely around the multiplicity of conductors with an overlap and, filling the interstices between these insulated conductors and between them and the layer of insulating tape from end to end of the cable unit length, a water-impermeable medium which will not drain under the influence of gravity or such hydrostatic pressure as may arise in the event of damage to the cable sheath but which will permit relative sliding movement of the cellular plastics insulated conductors over one another during such bending of the cable as occurs during manufacture and installation of the cable, the layer of insulating tape being impregnated with the water-impermeable medium and constituting a barrier to the ingress of water.
Claim 7
Dependent Claim
28 words
A telecommunication cable as claimed in claim 7, wherein the transversely folded tape is retained in place by means of a binder applied helically about the cable unit.
Claim 8
Dependent Claim
15 words
A telecommunication cable as claimed in claim 8, wherein the binder comprises a plastics tape.
Claim 9
Dependent Claim
105 words
A method of manufacturing a telecommunication cable in accordance with claim 1, comprising: forming each of at least two cable units by introducing a water-impermeable medium into the interstices between a multiplicity of conductors, each having a dielectric of plastics material of cellular form, in stages as the conductors are being assembled, and applying to the assembled conductors at least one layer of insulating tape having a porosity such that it will become impregnated with the water-impermeable medium and will consitute a barrier to the ingress of water; laying up the cable units so formed; and enclosing the laid-up cable units in a water-proof sheath.
References Cited (Backward Citations)
CH66588A
Cited
US1904162A
Cited
US2269877A
Cited
US3244799A
Cited
GB995582A
Cited
US3420720A
Cited
US3271508A
Cited
GB1095639A
Cited
US3525798A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |