Patent US3717833A successfully refreshed from Google Patents.
US3717833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transformer
Assignee: Sony Corp
•
Filing: 1971-08-23
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Granted: 1973-02-20
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Expires: 1991-08-23
Abstract
Abstract A transformer having primary and secondary windings on a conductive non-magnetic bobbin. A pot-type core surrounds the bobbin and windings and has a central magnetic core extending axially into the bobbin and windings. Flanges on the bobbin separate the primary from the secondary, and the flanges and bobbin have a slot to limit induction current losses. The secondary is center-tapped, and the flanges and conductive, nonmagnetic outer case prevent electric field coupling and suppress leakage at the center tap.
Inventors
- 👤 S Agawa
- 👤 Y Kubota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:27
CPC Classifications
H; H01; H01F; H01F19/00; H01F27/00; H01F27/34; H01F27/36; H01F27/363; H04; H04N; H04N9/00; H04N9/01
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
8 words
a post extending in said hollow hub, and
Claim 2
Dependent Claim
8 words
a post extending in said hollow hub, and
Claim 3
Dependent Claim
11 words
a plurality of flanges, each having a generally radial slot, and
Claim 4
Dependent Claim
11 words
a plurality of flanges, each having a generally radial slot, and
Claim 5
Dependent Claim
11 words
A transformer comprising: A. A bobbin of non-magnetic conductive metal comprising:
Claim 6
Dependent Claim
11 words
A transformer comprising: A. A bobbin of non-magnetic conductive metal comprising:
References Cited (Backward Citations)
US1624560A
Cited
US2085434A
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US2183355A
Cited
DE733913C
Cited
US2533920A
Cited
US2896096A
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US3393388A
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US3517361A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |