US2458556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coupled cavity resonator and wave guide apparatus
Assignee: AT&T Inc
•
Filing: 1942-03-05
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Granted: 1949-01-11
•
Expires: 1962-03-05
Abstract
No abstract record available.
Inventors
- 👤 Arnold E Bowen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:06
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/02; H01J25/10; H01J25/12; H01J25/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2153728A
Cited
US2200986A
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US2190668A
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US2242275A
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US2259690A
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US2306860A
Cited
US2368031A
Cited
US2317140A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-01-11 | 1952-07-12 | 1953-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-01-11 | 1956-07-12 | 1957-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-01-11 | 1960-07-12 | 1961-01-11 | $7700.00 | Window Closed / Lapsed |