US2509864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic amplifier
Assignee: ABB Norden Holding AB
•
Filing: 1946-06-19
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Granted: 1950-05-30
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Expires: 1966-06-19
Abstract
No abstract record available.
Inventors
- 👤 Hedstrom Sven Eric
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:13
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/32; G05F1/33; G05B; G05B11/00; G05B11/01; G05B11/012; G05B11/016; H; H03; H03F; H03F9/00; H03F9/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1434346A
Cited
US2169093A
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US2338423A
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US2265930A
Cited
US2373383A
Cited
CH228082A
Cited
US2399185A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-29 | 1953-11-28 | 1954-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-29 | 1957-11-28 | 1958-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-29 | 1961-11-28 | 1962-05-30 | $7700.00 | Window Closed / Lapsed |