US3858138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tuneable thin film inductor
Assignee: RCA Corp
•
Filing: 1974-05-10
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Granted: 1974-12-31
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Expires: 1994-05-10
Abstract
Abstract A flat inductor, one half of which is provided as a first set of parallel conductive strips printed on a substrate, each of which constitutes one half of each turn of a helix. A flat sleeve of insulating material is adherently disposed over the substrate strips leaving the ends of the strips exposed. The other half of the helix is provided as a second set of parallel conductive strips printed on the sleeve with the ends of the second set of strips contacting the exposed ends of the first set. A flat strip-like magnetic core member is slidably disposed within the sleeve.
Inventors
- 👤 J Gittleman
- 👤 L Zappulla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:59
CPC Classifications
H; H01; H01F; H01F21/00; H01F21/02; H01F21/06; H01F27/00; H01F27/24; H01F17/00; H01F17/0006; H01F2017/0066
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
137 words
A TUNEABLE FILM TYPE INDICATOR COMPRISING A FIRST SERIES OF METAL FILM STRIPES ADHERED TO AN INSULATING MATERIAL COVERING SAID SYNTHETIC RESINOUS FILM OF INSULATING MATERIAL COVERING SAID STRIPES EXCEPT THE END THEREOF, A SECOND SYNTHETIC RESINOUS FILM OF INSULATING MATERIAL OVER SAID FIRST FILM AND HAVING A CENTRAL PORTION SPACED THEREFROM, BOTH OF SAID FILMS BEING JOINED ALONG THEIR EDGES SUCH THAT BOTH FILMS TOGETHER FORM A SLEEVE, A SECOND SERIES OF METAL FILM STRIPES ON TOP OF SAID SECOND FILM OF INSULATING MATERIAL, EACH MEMBER OF SAID SECOND SERIES OF STRIPS BEING CONNECTED TO MEMBERS OF SAID FIRST SERIES OF STRIPES TO FORM A CONTINUOUS FLAT HELIX, AND A MOVEABLE MEMBER OF MAGNETIC MATERIAL DISPOSED BETWEEN SAID INSULATING FILMS, SAID MOVEABLE MEMBER COMPRISING THIN STRIP OF DIELECTRIC MATERIAL WITH A COATING OF FERROMAGNETIC MATERIAL THEREON.
Claim 2
Dependent Claim
137 words
A TUNEABLE FILM TYPE INDICATOR COMPRISING A FIRST SERIES OF METAL FILM STRIPES ADHERED TO AN INSULATING MATERIAL COVERING SAID SYNTHETIC RESINOUS FILM OF INSULATING MATERIAL COVERING SAID STRIPES EXCEPT THE END THEREOF, A SECOND SYNTHETIC RESINOUS FILM OF INSULATING MATERIAL OVER SAID FIRST FILM AND HAVING A CENTRAL PORTION SPACED THEREFROM, BOTH OF SAID FILMS BEING JOINED ALONG THEIR EDGES SUCH THAT BOTH FILMS TOGETHER FORM A SLEEVE, A SECOND SERIES OF METAL FILM STRIPES ON TOP OF SAID SECOND FILM OF INSULATING MATERIAL, EACH MEMBER OF SAID SECOND SERIES OF STRIPS BEING CONNECTED TO MEMBERS OF SAID FIRST SERIES OF STRIPES TO FORM A CONTINUOUS FLAT HELIX, AND A MOVEABLE MEMBER OF MAGNETIC MATERIAL DISPOSED BETWEEN SAID INSULATING FILMS, SAID MOVEABLE MEMBER COMPRISING THIN STRIP OF DIELECTRIC MATERIAL WITH A COATING OF FERROMAGNETIC MATERIAL THEREON.
Claim 3
Dependent Claim
15 words
An inductor according to claim 1 in which said ferromaganetic layer is a sputtered layer.
Claim 4
Dependent Claim
17 words
An inductor according to claim 1 in which said coating of ferromagnetic material is of variable composition.
Claim 5
Dependent Claim
17 words
An inductor according to claim 1 in which said coating of ferromagnetic material is of variable thickness.
Claim 6
Dependent Claim
20 words
An inductor according to claim 1 in which said coating of ferromagnetic materiaL is on both sides of said strip.
References Cited (Backward Citations)
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US3000079A
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US2989630A
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US3210707A
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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) | 1977-12-30 | 1978-07-01 | 1978-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-30 | 1982-07-01 | 1982-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-30 | 1986-07-01 | 1986-12-31 | $7700.00 | Window Closed / Lapsed |