US2477232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cavity resonator
Assignee: AT&T Inc
•
Filing: 1945-03-28
•
Granted: 1949-07-26
•
Expires: 1965-03-28
Abstract
No abstract record available.
Inventors
- 👤 David E Branson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:30
CPC Classifications
H; H01; H01P; H01P7/00; H01P7/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1976804A
Cited
US2109843A
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US2106769A
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US2132208A
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US2189284A
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US2203806A
Cited
US2287845A
Cited
US2304186A
Cited
GB539498A
Cited
US2379047A
Cited
US2396172A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-07-25 | 1953-01-24 | 1953-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-07-25 | 1957-01-24 | 1957-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-07-25 | 1961-01-24 | 1961-07-26 | $7700.00 | Window Closed / Lapsed |