US3389330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fail safe magnetic amplifier voltage control system
Assignee: Umicore NV SA
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Filing: 1965-12-17
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Granted: 1968-06-18
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Expires: 1985-12-17
Abstract
No abstract record available.
Inventors
- 👤 Jean Demeur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:34
CPC Classifications
H; H03; H03F; H03F9/00; H03F9/02; B; B61; B61L; B61L5/00; B61L5/12; B61L5/18; B61L5/1809; B61L5/1881; B61L29/00; B61L29/08; B61L29/18; B61L29/24; B61L29/28; B61L29/288; H01; H01F; H01F29/00; H01F29/14; H01F29/143; H02; H02H; H02H7/00; H03F9/04; H03K; H03K17/00; H03K17/51; H03K17/80
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-18 | 1971-12-18 | 1972-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-18 | 1975-12-18 | 1976-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-18 | 1979-12-18 | 1980-06-18 | $7700.00 | Window Closed / Lapsed |