US3593245A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double-tuned intermediate-frequency transformer
Assignee: Panasonic Holdings Corp
•
Filing: 1969-04-14
•
Granted: 1971-07-13
•
Expires: 1989-04-14
Abstract
Abstract A double-tuned intermediate-frequency transformer having a structure wherein two single-tuned intermediate-frequency transformers employing cap-type cores provided with center cores therein are arranged adjacent to each other being covered with one shielding case, and being adapted to a free choice of the degree of coupling between the respective coils of the two single-tuned intermediate-frequency transformers laid adjacent to each other through adoption of the cap-type cores each having a suitable sleeve length relative to the length of its center core.
Inventors
- 👤 Kazutomo Iwata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:25
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/01; H03H7/0153; H03H7/0161; H03H7/0169; H03H7/0184; H01; H01F; H01F17/00; H01F17/04; H03H7/17; H03H7/1741; H03H7/1775
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
A double-tuned intermediate-frequency transformer comprising a plurality of single-tuned intermediate-frequency transformers disposed adjacent to each other, each of said single-tuned intermediate-frequency transformers comprising, in combination: a winding portion having a center hole therein disposed at the center of the upper surface of a terminal plate, a coil wound on the outer periphery of said winding portion, a core supporter having a cap type core provided with a center core securely fixed tO the upper portion thereof threadedly fitted into said center hole; a single shielding case covering said plurality of singletuned intermediate-frequency transformers; wherein the degree of magnetic coupling via the air gap between the respective coils of said plurality of single-tuned intermediate-frequency transformers is freely adjustable by the suitable selection of the length of a sleeve portion of said cap type core relative to the length of said center core, respectively, thereof.
Claim 2
Dependent Claim
143 words
A double-tuned intermediate-frequency transformer comprising a plurality of single-tuned intermediate-frequency transformers disposed adjacent to each other, each of said single-tuned intermediate-frequency transformers comprising, in combination: a winding portion having a center hole therein disposed at the center of the upper surface of a terminal plate, a coil wound on the outer periphery of said winding portion, a core supporter having a cap type core provided with a center core securely fixed tO the upper portion thereof threadedly fitted into said center hole; a single shielding case covering said plurality of singletuned intermediate-frequency transformers; wherein the degree of magnetic coupling via the air gap between the respective coils of said plurality of single-tuned intermediate-frequency transformers is freely adjustable by the suitable selection of the length of a sleeve portion of said cap type core relative to the length of said center core, respectively, thereof.
References Cited (Backward Citations)
US1634923A
Cited
US1978600A
Cited
US2318415A
Cited
US2438770A
Cited
US2388295A
Cited
GB580782A
Cited
US2435630A
Cited
US2483919A
Cited
GB744234A
Cited
US2837726A
Cited
US2823359A
Cited
US3155895A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |