US3855561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High frequency coil having an adjustable ferrite pot core
Assignee: Siemens AG
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Filing: 1972-12-18
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Granted: 1974-12-17
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Expires: 1992-12-18
Abstract
Abstract A high frequency coil having an adjustable ferrite pot core wherein a movable cylindrical core can be shifted in its axial direction through a center bore in a first pot core member in such a way that one of the frontal surfaces of the movable core together with a fixed member of the pot core forms a variable air gap and wherein the coil is arranged about the fixed member of the pot core and is embodied as a planar winding.
Inventors
- 👤 P Gottschalt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:15
CPC Classifications
H; H01; H01F; H01F17/00; H01F17/04; H01F17/043; H01F17/0006; H01F27/00; H01F27/28; H01F27/2804; H01F27/2819
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
150 words
High frequency coil apparatus, comprising: a variable air gap pot core including a first core member having a bore therein, a second core member having a fixed part with a surface facing said bore, and a movable core member disposed in and movable in said bore and having a surface which with the surface of said fixed part defines a variable air gap; and a planar coil disposed about said fixed part which comprises a plurality of concentric circular conductors each having a separation therein, and a plurality of radially extending conductor sections, connecting adjacent circular conductors at respective separations and wherein the plane of said coil is parallel to said surface of said fixed part and is disposed at a distance from said surface of said fixed part in the range of from 1/6 of the maximum length to one-half of the minimum length of the variable air gap.
Claim 2
Dependent Claim
150 words
High frequency coil apparatus, comprising: a variable air gap pot core including a first core member having a bore therein, a second core member having a fixed part with a surface facing said bore, and a movable core member disposed in and movable in said bore and having a surface which with the surface of said fixed part defines a variable air gap; and a planar coil disposed about said fixed part which comprises a plurality of concentric circular conductors each having a separation therein, and a plurality of radially extending conductor sections, connecting adjacent circular conductors at respective separations and wherein the plane of said coil is parallel to said surface of said fixed part and is disposed at a distance from said surface of said fixed part in the range of from 1/6 of the maximum length to one-half of the minimum length of the variable air gap.
Claim 3
Dependent Claim
24 words
Apparatus according to claim 1, wherein said planar coil comprises a foil of electrically insulating material and printed circuit windings carried on said foil.
Claim 4
Dependent Claim
22 words
Apparatus according to claim 1, wherein said planar coil comprises an electrically insulating substrate and a conductive layer deposited on said substrate.
Claim 5
Dependent Claim
22 words
Apparatus according to claim 1, wherein said planar coil comprises an electrically insulating substrate and a metal strip fixed upon said substrate.
Claim 6
Dependent Claim
23 words
Apparatus according to claim 1, wherein said planar coil comrpises terminals extending at an angle with respect to the plane of said coil.
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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) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |