US2465639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cavity resonator
Assignee: AT&T Inc
•
Filing: 1945-01-31
•
Granted: 1949-03-29
•
Expires: 1965-01-31
Abstract
No abstract record available.
Inventors
- 👤 William A Edson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:45
CPC Classifications
H; H03; H03J; H03J3/00; H03J3/02; H03J3/06; H01; H01P; H01P7/00; H01P7/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1802767A
Cited
US2106769A
Cited
US2242404A
Cited
US2235521A
Cited
US2423506A
Cited
US2405277A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-03-28 | 1952-09-27 | 1953-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-03-28 | 1956-09-27 | 1957-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-03-28 | 1960-09-27 | 1961-03-29 | $7700.00 | Window Closed / Lapsed |