Patent US4494100A successfully refreshed from Google Patents.
US4494100A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Planar inductors
Assignee: Motorola Solutions Inc
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Filing: 1982-07-12
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Granted: 1985-01-15
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Expires: 2002-07-12
Abstract
Abstract A planar inductance element includes a generally flat substrate of electrically insulating material. First and second substantially flat spiral coils, having respective inner and outer ends, are disposed on opposite sides of the substrate. The coils are spiraled in the same direction as viewed from one side of the substrate with one coil spiraling out and one spiraling in. The inner ends of the coils are joined through the substrate to couple the coils in series. The outer ends of the coils provide terminals for the inductor. The means/methods are disclosed for discretely and progressively trimming the inductor.
Inventors
- 👤 Robert E. Stengel
- 👤 Charles W. Nejdl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:18
CPC Classifications
H; H01; H01F; H01F5/00; H01F5/003; H01F17/00; H01F17/0006; H01F41/00; H01F41/02; H01F41/04; H01F41/041; H01F41/045; H01Q; H01Q1/00; H01Q1/36; H01Q1/38; H01Q7/00; H01F2017/006; H05; H05K; H05K1/00; H05K1/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
205 words
An inductor comprising: a generally flat substrate of electrically insulating material; a first substantially flat spiral coil disposed on one side of said substrate and having an inner end and an outer end; trimmable shorting means, disposed on said one side of said substrate, for electrically shorting portions of said first coil to facilitate adjustment of said inductor by selectively trimming said shorting means; a second substantially flat spiral coil disposed on the opposite side of said substrate and having an inner and an outer end; said inner ends of said first and second coils being joined through said substrate forming a continuous coil with said first coil spiraling in and said second coil spiraling out; said first and second coils being spiraled in the same direction as viewed from the outer end of each coil when each coil is viewed individually with said substrate oriented to position the viewed coil on the viewed side of said substrate so that an additive mutual inductive effect is achieved between said first and second coils resulting in an inductance greater than that of the sum of the inductance of the first and second coils; and said outer ends of said continuous coil providing terminals for the inductor.
Claim 2
Dependent Claim
205 words
An inductor comprising: a generally flat substrate of electrically insulating material; a first substantially flat spiral coil disposed on one side of said substrate and having an inner end and an outer end; trimmable shorting means, disposed on said one side of said substrate, for electrically shorting portions of said first coil to facilitate adjustment of said inductor by selectively trimming said shorting means; a second substantially flat spiral coil disposed on the opposite side of said substrate and having an inner and an outer end; said inner ends of said first and second coils being joined through said substrate forming a continuous coil with said first coil spiraling in and said second coil spiraling out; said first and second coils being spiraled in the same direction as viewed from the outer end of each coil when each coil is viewed individually with said substrate oriented to position the viewed coil on the viewed side of said substrate so that an additive mutual inductive effect is achieved between said first and second coils resulting in an inductance greater than that of the sum of the inductance of the first and second coils; and said outer ends of said continuous coil providing terminals for the inductor.
Claim 3
Dependent Claim
13 words
The inductor of claim 1 wherein said coils have equal numbers of spirals.
Claim 4
Dependent Claim
20 words
The inductor of claim 2 wherein the area of said substrate covered by each of said coils is substantially equal.
Claim 5
Dependent Claim
32 words
The inductor of claim 1 wherein said outer end of said first coil and said outer end of said second coil lead away from the respective coils in generally diametrically opposite directions.
Claim 6
Dependent Claim
45 words
The inductor of claim 1 wherein said trimmable shorting means includes conductive paths joining and shorting at least some of the respective spirals of said continuous coil whereby said conductive paths may be discretely cut between the spirals to vary the inductance of the inductor.
Claim 7
Dependent Claim
42 words
The inductor of claim 1 wherein said trimmable shorting means includes a conductive layer shorting a portion of the spirals of said continuous coil whereby said layer may be progressively cut between the spirals to continuously vary the inductance of the inductor.
Claim 8
Dependent Claim
14 words
The inductor of claim 6 wherein said conductive layer is of low resistive material.
Claim 9
Dependent Claim
22 words
The inductor of claim 1 wherein said substrate is composed of a flexible material which may be deformed into a non-planar geometry.
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) | 1988-01-15 | 1988-07-16 | 1989-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-15 | 1992-07-16 | 1993-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-15 | 1996-07-16 | 1997-01-15 | $7700.00 | Window Closed / Lapsed |