Patent US1389770A successfully refreshed from Google Patents.
US3408553A
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US
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Driven inverter-regulator with magnetic amplifier in feedback loop
Assignee: AT&T Inc
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Filing: 1966-04-11
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Granted: 1968-10-29
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Expires: 1986-04-11
Abstract
No abstract record available.
Inventors
- 👤 John D Bishop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:13
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H02M7/538; H02M7/53803; H02M7/53806
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US3101439A
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US3219907A
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US3343065A
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US3324377A
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US3295053A
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US3293530A
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US3295043A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-29 | 1972-04-29 | 1972-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-29 | 1976-04-29 | 1976-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-29 | 1980-04-29 | 1980-10-29 | $7700.00 | Window Closed / Lapsed |