Patent US405507A successfully refreshed from Google Patents.
US3374440A
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US
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Magnetic amplifier controlled power circuit operative with d.c. electric source
Assignee: Hitachi Ltd
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Filing: 1963-11-25
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Granted: 1968-03-19
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Expires: 1983-11-25
Abstract
No abstract record available.
Inventors
- 👤 Kawai Yoshinori
- 👤 Kiwaki Hisakatsu
- 👤 Sato Hiroshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:41
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; H02M7/516; H03; H03F; H03F9/00; H03F9/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3034015A
Cited
US3189748A
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US3078380A
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US3209227A
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US3237126A
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US3251006A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-19 | 1971-09-18 | 1972-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-19 | 1975-09-18 | 1976-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-19 | 1979-09-18 | 1980-03-19 | $7700.00 | Window Closed / Lapsed |