US3638306A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a communications cable
Assignee: AT&T Inc
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Filing: 1970-09-24
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Granted: 1972-02-01
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Expires: 1990-09-24
Abstract
Abstract A communications cable comprises a waterproof core of conductors and a sheath including an unsoldered steel layer for providing mechanical and rodent protection. The steel layer is stretchformed to attain a tightly registered longitudinal seam which eliminates the necessity of soldering or other means of mechanically joining the seam. Coatings of appropriate thermoplastic materials are placed on the surfaces of the steel layer and drawn into the seam by capillary action to provide a seal against water ingress.
Inventors
- 👤 Henry N Padowicz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:48
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/17; H01B7/28; H01B11/00; H01B11/02; H01B11/06; H01B11/10; H01B11/1016; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
80 words
A method of making a communications cable comprising the steps of: forming a waterproof core of conductors; longitudinally folding a corrugated layer of conductive metal about said core; cold-working and stretch-forming a corrugated layer of steel about said layer of conductive metal such that a tightly registered longitudinal seam is formed by the edges of said steel layer without the necessity of mechanically joining said edges; and extruding a thermoplastic jacket about said steel layer to provide corrosion protection thereto.
Claim 2
Independent Claim
80 words
A method of making a communications cable comprising the steps of: forming a waterproof core of conductors; longitudinally folding a corrugated layer of conductive metal about said core; cold-working and stretch-forming a corrugated layer of steel about said layer of conductive metal such that a tightly registered longitudinal seam is formed by the edges of said steel layer without the necessity of mechanically joining said edges; and extruding a thermoplastic jacket about said steel layer to provide corrosion protection thereto.
Claim 3
Dependent Claim
29 words
The method of claim 1 including the step of flooding each side of said steel layer with a corrosion-resistant, waterproof material while said layer is being cold-rolled and stretch-formed.
Claim 4
Independent Claim
65 words
A method of providing mechanical and rodent protection to a communications cable comprising the steps of: cold-working and stretch-forming a corrugated layer of steel about said cable such that a tightly registered longitudinal seam is formed by the edges of said steel layer without the necessity of mechanically joining said edges; and extruding a thermoplastic jacket about said steel layer to provide corrosion protection thereto.
Claim 5
Independent Claim
65 words
A method of providing mechanical and rodent protection to a communications cable comprising the steps of: cold-working and stretch-forming a corrugated layer of steel about said cable such that a tightly registered longitudinal seam is formed by the edges of said steel layer without the necessity of mechanically joining said edges; and extruding a thermoplastic jacket about said steel layer to provide corrosion protection thereto.
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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |