US2812032A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Doubly resonant filter
Assignee: AT&T Inc
•
Filing: 1953-07-08
•
Granted: 1957-11-05
•
Expires: 1973-07-08
Abstract
No abstract record available.
Inventors
- 👤 Winston E Kock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:30
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/18; G10K11/22; H; H03; H03H; H03H9/00; H03H9/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2063944A
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US2065578A
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US2297046A
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US2459162A
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US2326612A
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US2308886A
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US2382159A
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US2423506A
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US2473610A
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US2581780A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-04 | 1961-05-06 | 1961-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-04 | 1965-05-06 | 1965-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-04 | 1969-05-06 | 1969-11-05 | $7700.00 | Window Closed / Lapsed |