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US2669657A
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Electromagnetic lens
Assignee: AT&T Inc
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Filing: 1949-11-19
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Granted: 1954-02-16
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Expires: 1969-11-19
Abstract
No abstract record available.
Inventors
- 👤 Cassius C Cutler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:19
CPC Classifications
H; H01; H01Q; H01Q15/00; H01Q15/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2273447A
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US2332930A
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US2398095A
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US2438343A
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US2501658A
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US2415352A
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US2479673A
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US2479907A
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US2547416A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-15 | 1957-08-17 | 1958-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-15 | 1961-08-17 | 1962-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-15 | 1965-08-17 | 1966-02-16 | $7700.00 | Window Closed / Lapsed |