US3686428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple strand conductor with increased contact resistance
Assignee: IND PHIRELLI SOC PER AZIONI
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Filing: 1971-10-26
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Granted: 1972-08-22
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Expires: 1991-10-26
Abstract
Abstract A conductor of stranded copper wires having a coating of chromium or chromium-based metal between the contacting surfaces of all or a portion of such wires to increase the contact resistance thereof. Also, a cable having a plurality of layers of such wires with such a coating between at least a pair of layers.
Inventors
- 👤 Aurelio Lombardi
- 👤 Pietro Anelli
- 👤 Gianfranco Bianchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:59
CPC Classifications
H; H01; H01B; H01B5/00; H01B5/08; H01B5/10; H01B5/107; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/926; Y10S428/9335; Y10S428/934; Y10S505/00; Y10S505/825; Y10S505/884; Y10S505/887; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12806; Y10T428/12826; Y10T428/12847; Y10T428/12861; Y10T428/12903; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2936
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
22 words
A conductor as set forth in claim 1, wherein said coating has a thickness in the range from 1 to 20 microns.
Claim 2
Dependent Claim
14 words
A conductor as set forth in claim 1, wherein said coating is passivated chromium.
Claim 3
Dependent Claim
18 words
A conductor as set forth in claim 1, whErein each of said wires is surrounded by said coating.
Claim 4
Dependent Claim
16 words
A conductor as set forth in claim 1, wherein the metal of said wires is copper.
Claim 5
Dependent Claim
48 words
A conductor as set forth in claim 1, wherein said wires are arranged in a plurality of layers around a central axis and said coating is between the radially outer surfaces of one wire layer and the adjacent surfaces of the wires of the next radially outward layer.
Claim 6
Dependent Claim
20 words
A conductor as set forth in claim 6, wherein said coating is between each of a plurality of said layers.
Claim 7
Dependent Claim
85 words
An alternating current cable having a core comprising a plurality of stranded wires extending around the axis of said core and at least one layer of stranded wires surrounding and contacting the wires of said core, at least a plurality of said wires having a coating thereon at least between such last-mentioned wires and the next adjacent wires, said coating being selected from the group consisting of chromium and chromium-based metals and the metal of the coated wires being different from that of the coating.
Claim 8
Dependent Claim
33 words
A cable as set forth in claim 8, wherein said coating is on the radially outward surfaces of the outer wires of said core and between the latter and said layer of wires.
Claim 9
Dependent Claim
34 words
A cable as set forth in claim 8, wherein said wires are made of copper, said coating is chromium-plated thereon and said coating has a thickness in the range from 1 to 20 microns.
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) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |