US2887664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Faraday-effect device for electro-magnetic waves
Assignee: AT&T Inc
•
Filing: 1955-09-13
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Granted: 1959-05-19
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Expires: 1975-09-13
Abstract
No abstract record available.
Inventors
- 👤 Clarence L Hogan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:37
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/165; H01P1/175; H03; H03H; H03H7/00; H03H7/002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2051537A
Cited
US2593120A
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US2742930A
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US2650350A
Cited
US2685065A
Cited
US2644930A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-18 | 1962-11-17 | 1963-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-18 | 1966-11-17 | 1967-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-18 | 1970-11-17 | 1971-05-19 | $7700.00 | Window Closed / Lapsed |