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Patent US2694178A successfully refreshed from Google Patents.
US2694178A
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Electromagnetic control apparatus
Assignee: AT&T Inc
•
Filing: 1951-10-30
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Granted: 1954-11-09
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Expires: 1971-10-30
Abstract
No abstract record available.
Inventors
- 👤 Donald H Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:59
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/32; G05F1/33
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE685951C
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US2218711A
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US2309156A
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US2324634A
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US2339406A
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US2465352A
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US2435062A
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US2473617A
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US2560284A
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US2503880A
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US2596685A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-11-08 | 1958-05-10 | 1958-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-08 | 1962-05-10 | 1962-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-08 | 1966-05-10 | 1966-11-09 | $7700.00 | Window Closed / Lapsed |