Patent US4079192A successfully refreshed from Google Patents.
US4079192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conductor for reducing leakage at high frequencies
Assignee: Individual
•
Filing: 1974-06-12
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Granted: 1978-03-14
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Expires: 1994-06-12
Abstract
Abstract Conductive wire coated with a thin magnetic film which is encircled by an insulating sheath. In various applications a plurality of said wires are wound together to provide a conductor having a low leakage due to eddy currents and dielectric leakage at certain frequencies.
Inventors
- 👤 Bernard Josse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:36
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/30; H01B11/00; H01B11/02; H01B11/12; H01B11/14
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
94 words
Method of reducing the Joule losses in each conductive wire of a multistrand electrical conductor carrying frequencies in excess of 50 KHz, which losses result from the eddy currents induced by the magnetic fields generated by the currents which pass through the other conductive wires of said multi-strand conductor, which method comprises the steps of covering each conductive wire in said multi-strand conductor with an individual sheath of magnetic material which absorbs and concentrates the flux of said magnetic fields, and surrounding each sheath of magnetic material with an electrically and magnetically insulating sheath.
Claim 2
Dependent Claim
94 words
Method of reducing the Joule losses in each conductive wire of a multistrand electrical conductor carrying frequencies in excess of 50 KHz, which losses result from the eddy currents induced by the magnetic fields generated by the currents which pass through the other conductive wires of said multi-strand conductor, which method comprises the steps of covering each conductive wire in said multi-strand conductor with an individual sheath of magnetic material which absorbs and concentrates the flux of said magnetic fields, and surrounding each sheath of magnetic material with an electrically and magnetically insulating sheath.
Claim 3
Dependent Claim
22 words
Method as claimed in claim 1 in which said sheath of magnetic material is a thin continuous film of said magnetic material.
Claim 4
Dependent Claim
29 words
Method as claimed in claim 1 which comprises the step of coating said insulating sheath with a second sheath of magnetic material and superimposing thereon a second insulating sheath.
Claim 5
Dependent Claim
23 words
Method as claimed in claim 1 which comprises the additional step of winding a plurality of said multistrand conductors about a central core.
Claim 6
Dependent Claim
70 words
A multistrand conductor for carrying alternating current at a frequency in excess of 50 KHz which comprises a plurality of conductive wires, each covered by a sheath of magnetic material for absorbing the magnetic flux of the magnetic fields generated by the currents passing through the other conductive wires of said multistrand conductor, and each sheath of magnetic material being surrounded by a sheath of electrically and magnetically insulating material.
Claim 7
Dependent Claim
70 words
A multistrand conductor for carrying alternating current at a frequency in excess of 50 KHz which comprises a plurality of conductive wires, each covered by a sheath of magnetic material for absorbing the magnetic flux of the magnetic fields generated by the currents passing through the other conductive wires of said multistrand conductor, and each sheath of magnetic material being surrounded by a sheath of electrically and magnetically insulating material.
Claim 8
Dependent Claim
22 words
Conductor as claimed in claim 5 in which said sheath of magnetic material is a thin continuous film of said magnetic material.
Claim 9
Dependent Claim
27 words
Conductor as claimed in claim 5 in which said magnetic sheath is made of a material selected from the group consisting of magnetic metals and ferromagnetic alloys.
Claim 10
Dependent Claim
17 words
Conductor as claimed in claim 7 in which said magnetic sheath is made of an iron alloy.
Claim 11
Dependent Claim
31 words
Conductor as claimed in claim 7 in which said magnetic sheath comprises a powder selected from the group consisting of magnetic metals and mixed magnetic oxides agglomerated by an insulating binder.
Claim 12
Dependent Claim
17 words
Conductor comprising a plurality of multistrand conductors as claimed in claim 5, wound about a central core.
Claim 13
Dependent Claim
16 words
Conductor as claimed in claim 10 in which said core is made of an insulating material.
Claim 14
Dependent Claim
12 words
Conductor as claimed in claim 11 in which said core is hollow.
Claim 15
Dependent Claim
40 words
Conductor as claimed in claim 12 in which said hollow core contains a composite conductor comprising a plurality of individual wires, each provided with a magnetic coating covered by an insulating coating and wound together to form a composite conductor.
Claim 16
Dependent Claim
21 words
Conductor as claimed in claim 5 in which said wire is made of beryllium and cooled by circulation of liquid nitrogen.
Claim 17
Dependent Claim
19 words
Conductor as claimed in claim 5 in which the individual wires have a diameter of 0.02 - 1.0 mm.
Claim 18
Dependent Claim
28 words
Conductor as claimed in claim 15 in which the thickness of the sheaths of magnetic material lies between 1/3 and 1/100 of the radius of the individual wires.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-13 | 1981-09-12 | 1982-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-13 | 1985-09-12 | 1986-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-13 | 1989-09-12 | 1990-03-14 | $7700.00 | Window Closed / Lapsed |