US3629489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cable sheathing
Assignee: General Cable Corp
•
Filing: 1968-05-13
•
Granted: 1971-12-21
•
Expires: 1988-05-13
Abstract
Abstract This improvement in Stalpeth (steel/aluminum/polyethylene) cable sheath has the aluminum strip coated with a waterproof coating so that in the event of puncture of the soldered steel envelope, the water that gets between the steel and the aluminum cannot interrupt the continuity of the metallic shield by corrosion of the dissimilar metals in contact with the water. In the preferred construction, the coating on the aluminum is fused to the steel around part of the circumference, and aluminum touches the steel along a protected longitudinally extending area to provide electrical continuity, and this is most conveniently located under the soldered seam of the steel jacket.
Inventors
- 👤 Ludwik Jachimowicz
- 👤 Joseph B Masterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:27
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/17; H01B7/18; H01B7/20; H01B7/208; H01B7/28; H01B7/282; H01B7/2825
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
223 words
In an electrical cable including a core having a plurality of conductors, an inner metallic strip, of good electrical conductivity, longitudinally wrapped around the core, a transversely corrugated outer strip, of different kind of metal and of poorer electrical conductivity than the inner strip, longitudinally wrapped around the inner metallic strip with the longitudinal edges of the outer strip overlapped and metallically bonded together, and a protective plastic jacket covering the outer strip, the improvement which comprises a protective coating on both sides of the inner strip, from one edge region which is substantially bare of coating for establishing electrical conductivity from the outer to the inner strip, around the circumference of said inner strip continuously to the opposite edge portion thereof, said coating being of electrical insulating material bonded to the surfaces of the inner strip to prevent electrolysis of the different metals in the event of puncture of the jacket and the outer strip and resulting entry of water into the cable under the outer strip, the inner and outer strips being fusion-bonded together by the coating on the outside of the inner strip so that connection of the inner and outer strips is obtained on at least part of the cable circumference for preventing collapse of the corrugations, at cable ending, and resulting increase in re-reeling toleration of the cable.
Claim 2
Dependent Claim
223 words
In an electrical cable including a core having a plurality of conductors, an inner metallic strip, of good electrical conductivity, longitudinally wrapped around the core, a transversely corrugated outer strip, of different kind of metal and of poorer electrical conductivity than the inner strip, longitudinally wrapped around the inner metallic strip with the longitudinal edges of the outer strip overlapped and metallically bonded together, and a protective plastic jacket covering the outer strip, the improvement which comprises a protective coating on both sides of the inner strip, from one edge region which is substantially bare of coating for establishing electrical conductivity from the outer to the inner strip, around the circumference of said inner strip continuously to the opposite edge portion thereof, said coating being of electrical insulating material bonded to the surfaces of the inner strip to prevent electrolysis of the different metals in the event of puncture of the jacket and the outer strip and resulting entry of water into the cable under the outer strip, the inner and outer strips being fusion-bonded together by the coating on the outside of the inner strip so that connection of the inner and outer strips is obtained on at least part of the cable circumference for preventing collapse of the corrugations, at cable ending, and resulting increase in re-reeling toleration of the cable.
Claim 3
Dependent Claim
33 words
The electrical cable described in claim 1 characterized by the inner strip being aluminum, the outer strip being steel, and the electrical insulation of the inner strip being a thin layer of plastic.
Claim 4
Dependent Claim
111 words
The electrical cable described in claim 2 characterized by the longitudinally wrapped strips forming tubes, both of which are corrugated with corrugations fitting into one another, the edge portions of the aluminum strip extending in opposite directions toward their respective edges and overlapping one another in a lap seam extending lengthwise of the cable, the lap seam being sealed closed by fused together material of the plastic coating on the confronting faces of the aluminum strip where the edge portions overlap, the sealed seam of the aluminum tube cooperating with the fused connection between the tubes to prevent collapsing of the corrugations and to increase tolerance of the cable for re-reeling.
Claim 5
Dependent Claim
86 words
The electrical cable described in claim 3 characterized by the aluminum strip being of substantially the same width as the steel strip, and the upper edge Portion of the lap seam of the aluminum strip pressing upward against the inside of the surrounding steel strip with sufficient force to displace the insulating coating on the aluminum strip and establish the substantially bare edge region that provides an electric circuit between the aluminum and the steel around at least a portion of the circumference of the cable.
Claim 6
Dependent Claim
103 words
The electrical cable described in claim 3 characterized by the longitudinal seams of the aluminum strip and the steel strip being in adjacent positions around the circumference of the cable whereby fusing the seam of the outer steel strip also fuses the coating on the confronting edge faces of the aluminum strip, the steel strip having a fusion bond to the coating on the outside of the aluminum strip along the length of the cable and around at least a portion of the angular extend of the cable where the seams of the aluminum and the steel strips are adjacent to one another.
Claim 7
Dependent Claim
33 words
The electrical cable described in claim 1 characterized by the electrical insulating coating of the inner strip having a thickness on each surface of sad inner strip between about 1.5 and 3 mils.
Claim 8
Dependent Claim
39 words
The electrical cable described in claim 2 characterized by the aluminum strip having a thickness of metal between about 5 and 10 mils, and the steel strip also having a thickness of metal between about 5 and 10 mils.
Claim 9
Dependent Claim
24 words
The electrical cable described in claim 7 characterized by the plastic coating on the aluminum being between about 1.5 and 3 mils in thickness.
Claim 10
Dependent Claim
34 words
The electrical cable described in claim 1 characterized by the electrical insulating material on the inner strip being an adhesive layer of polyolefin comprising a copolymer of ethylene and other monomer containing carboxyl groups.
Claim 11
Dependent Claim
87 words
The electrical cable described in claim 3 characterized by the electrical insulating material on the inner strip being a plastic layer bonded to the aluminum but terminating before reaching the edge of the aluminum strip that forms the outer lap of the seam of the aluminum strip to provide the substantially bare surface in contact with an inside surface of the steel strip along the length of the cable to maintain electrical continuity of the aluminum and steel in the direction of the length of the cable.
Claim 12
Dependent Claim
101 words
The electrical cable described in claim 3 characterized by the outer edge portion of the inner strip being under the outer edge portion of the overlapping outer strip, solder along said outer edge of the overlapping outer strip, the substantially bare edge region of the inner strip being under the region of the solder and having surface contact with an inside surface of the outer strip along the length of the cable to maintain electrical continuity of the inner and outer strips whereby the inner strip provides a conductor in parallel with the outer strip throughout the length of the cable.
Claim 13
Dependent Claim
101 words
The electrical cable described in claim 11 characterized by the inner strip having edge portions extending in opposite directions toward their respective edges and overlapping one another in a lap seam extending lengthwise of the cable, said lap seam of the inner strip being sealed along its full length by coating fused on the confronting edge portion of the lap seam, the edge portion of the inner strip that has the substantially bare region in contact with the outer strip being the outer edge portion of the lap seam where the inner strip is of double thickness because of the lap.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |