US2870418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wave guide components controlled by ferromagnetically resonant elements
Assignee: AT&T Inc
•
Filing: 1952-05-06
•
Granted: 1959-01-20
•
Expires: 1972-05-06
Abstract
No abstract record available.
Inventors
- 👤 Jr William H Hewitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:19
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/10; H01P1/11
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2402948A
Cited
US2589494A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-19 | 1962-07-21 | 1963-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-19 | 1966-07-21 | 1967-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-19 | 1970-07-21 | 1971-01-20 | $7700.00 | Window Closed / Lapsed |