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US3982814A
Expired / Lapsed
US
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Dampened choke coil
Assignee: Siemens AG
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Filing: 1973-03-09
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Granted: 1976-09-28
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Expires: 1993-03-09
Abstract
Abstract A dampened choke coil structure having a ferromagnetic core and a winding of wire disposed about the core to form a choke coil. A second winding of substantially higher resistance material is wound generally parallel to the choke winding either inside or outside thereof. The number of turns of the two windings differ by more than 25%. In this way, parasitic capacitances are caused to have a decreased effect on the choke coils.
Inventors
- 👤 Hans-Peter Kaiserswerth
- 👤 Josef Wimmer
- 👤 Rudolf Schaller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:14
CPC Classifications
H; H01; H01F; H01F17/00; H01F17/04; H01F17/045; H01F27/00; H01F27/40; H01F37/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
70 words
A damped coil structure comprising a cylindrical core, a first winding of relatively low resistance wire wound directly on the core, a second winding of relatively high resistance material being directly wound against the first winding, the ferromagnetic core having outer connection parts embedded therein at opposite ends, the second winding being dc isolated from the first winding and having more than 25% more turns than the low resistance winding.
Claim 2
Dependent Claim
70 words
A damped coil structure comprising a cylindrical core, a first winding of relatively low resistance wire wound directly on the core, a second winding of relatively high resistance material being directly wound against the first winding, the ferromagnetic core having outer connection parts embedded therein at opposite ends, the second winding being dc isolated from the first winding and having more than 25% more turns than the low resistance winding.
Claim 3
Dependent Claim
39 words
A damped coil structure in accordance with claim 1 wherein the second winding comprises a plastic-like foil being coated with a layer of resistance material, the foil being wound a number of times around the relatively low resistance winding.
Claim 4
Dependent Claim
35 words
A damped coil structure in accordance with claim 1 wherein the relatively low resistance winding is wound on the core in a plurality of layers and wherein a resistance layer is arranged between the layers.
Claim 5
Dependent Claim
75 words
A damped coil structure comprising a cylindrical core, a first winding of relatively low resistance wire wound directly on the core, a second winding of relatively high resistance material being directly wound against the first winding, the ferromagnetic core having outer connection parts embedded therein at opposite ends, the second winding having a dc connection to said first winding at the two ends and having more than 25% less windings than the low resistance winding.
Claim 6
Dependent Claim
75 words
A damped coil structure comprising a cylindrical core, a first winding of relatively low resistance wire wound directly on the core, a second winding of relatively high resistance material being directly wound against the first winding, the ferromagnetic core having outer connection parts embedded therein at opposite ends, the second winding having a dc connection to said first winding at the two ends and having more than 25% less windings than the low resistance winding.
Claim 7
Dependent Claim
35 words
A damped coil structure in accordance with claim 4, wherein the relatively low resistance winding is wound on the core in a plurality of layers and wherein a resistance layer is arranged between the layers.
Claim 8
Dependent Claim
39 words
A damped coil structure in accordance with claim 4 wherein the second winding comprises a plastic-like foil being coated with a layer of resistance material, the foil being wound a number of times around the relatively low resistance winding.
References Cited (Backward Citations)
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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) | 1979-09-28 | 1980-03-29 | 1980-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-28 | 1984-03-29 | 1984-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-28 | 1988-03-29 | 1988-09-28 | $7700.00 | Window Closed / Lapsed |