Patent US2029700A successfully refreshed from Google Patents.
US4075591A
Expired / Lapsed
US
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Printed circuit coils
Assignee: Blaupunkt Werke GmbH
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Filing: 1977-01-31
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Granted: 1978-02-21
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Expires: 1997-01-31
Abstract
Abstract The conducting path width of a spiral printed circuit coil is reduced for the inside of the spiral coil to obtain more inductance in the same space without substantial sacrifice in Q. In another form of spiral coil with non-constant path width, the path width is reduced in a sector of the coil located between the inner and outer terminals to reduce the distance between terminals with minimum sacrifice in inductance or Q.
Inventors
- 👤 Dieter Haas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:59
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/28; H01F27/2804; H05; H05K; H05K1/00; H05K1/16; H05K1/165
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
74 words
A printed circuit coil of spiral configuration formed on a surface plate of insulating material providing substantially all of the inductance of a resonant circuit and composed of a layer of conducting material in a continuous spiral path providing a plurality of coil turns with a substantially constant spacing between adjacent turns and further having the improvement that the path width is not uniform and decreases from the outside turn to the inside turn.
Claim 2
Dependent Claim
74 words
A printed circuit coil of spiral configuration formed on a surface plate of insulating material providing substantially all of the inductance of a resonant circuit and composed of a layer of conducting material in a continuous spiral path providing a plurality of coil turns with a substantially constant spacing between adjacent turns and further having the improvement that the path width is not uniform and decreases from the outside turn to the inside turn.
Claim 3
Dependent Claim
37 words
A printed circuit coil as defined in claim 1, in which each successive turn of the spiral proceeding from the inside to the outside, is of greater average path width than the preceding turn inside of it.
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) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |