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US3790694A Expired / Lapsed US ⏱️ 0.0 years remaining

Filled telephone cable with bonded screening layer

Assignee: Pirelli and C SpA
•
Filing: 1973-05-23
•
Granted: 1974-02-05
•
Expires: 1993-05-23
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Abstract

Abstract A fully-filled telephone cable having a central core of insulated wires bunched together and held together by a layer of an insulating tape, both the spaces between the wires and the tape being filled with a solid or semi-solid gel derived from a paraffin, vaseline or mineral oil. The layer of tape is surrounded by a helically wrapped or longitudinally extending composite tape having an inner layer of paper filled by said gel and having an outer layer of a thermoplastic material. The layer of composite tape is surrounded by a helically wrapped or longitudinally extending screen comprising a metal tape coated on its inner and outer surfaces with a thermoplastic material, the inner surface coating being bonded to the outer layer of the composite tape by fusion. The screen is surrounded by a sheath of thermoplastic material having its inner surface bonded by fusion to the outer surface coating of the metal tape.

Inventors

  • 👤 A Portinari

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-25 09:17
CPC Classifications
H; H01; H01B; H01B13/00; H01B13/06; H01B13/14; H01B11/00; H01B11/02; H01B11/06; H01B7/00; H01B7/02; H01B7/0208; H01B7/0216

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 69 words
A telephone cable as set forth in claim 1, wherein said outer layer of said composite tape is bonded to said coating on said inner surface of said metal tape by fusion of said outer layer with said last-mentioned coating and said coating on said outer surface of said metal tape is bonded to said inner surface of said sheath by fusion of said last-mentioned coating with said sheath.
Claim 2
Dependent Claim 38 words
A telephone cable as set forth in claim 2, wherein said coating on said inner surface of said metal tape and said coating on said outer surface of said metal tape are adhesively bonded to said metal tape.
Claim 3
Dependent Claim 19 words
A telephone cable as set forth in claim 2, wherein said inner layer of said composite tape is paper.
Claim 4
Dependent Claim 24 words
A telephone cable as set forth in claim 4, wherein said inner layer is adhesively bonded to said outer layer of said composite tape.
Claim 5
Dependent Claim 22 words
A telephone cable as set forth in claim 2, wherein said composite tape is helically wrapped around said layer of insulating material.
Claim 6
Dependent Claim 28 words
A telephone cable as set forth in claim 2, wherein said composite tape extends longitudinally of said cable and has overlapping edges which extend longitudinally of said cable.
Claim 7
Dependent Claim 61 words
A telephone cable as set forth in claim 7, wherein said screen extends longitudinally of said cable and has overlapping edges whicH extend longitudinally of said cable and wherein said last-mentioned edges are disposed on the side of said insulating layer which is substantially diametrically opposite to the side thereof at which said overlapping edges of said composite tape are disposed.
Claim 8
Dependent Claim 33 words
A telephone cable as set forth in claim 2, wherein at least one of said thermoplastic materials is a thermoplastic material selected from the group consisting of polyethylene, polypropylene, ethylene-propylene copolymers and polyvinylchloride.
Claim 9
Dependent Claim 32 words
A telephone cable as set forth in claim 9, wherein said thermoplastic material forms at least one of said outer layer and said coating on said inner surface of said metal tape.

References Cited (Backward Citations)

US3332138A Cited
US3321572A Cited
US3622683A Cited
US3607487A Cited
US3706838A Cited
US3614299A Cited
US3733225A Cited
US3681515A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-02-04 1977-08-06 1978-02-05 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-02-04 1981-08-06 1982-02-05 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-02-04 1985-08-06 1986-02-05 $7700.00 Window Closed / Lapsed

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