US2653231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amplitude-discriminating circuits
Assignee: National Research Development Corp UK
•
Filing: 1948-10-13
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Granted: 1953-09-22
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Expires: 1968-10-13
Abstract
No abstract record available.
Inventors
- 👤 Edmund H Cooke-Yarborough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:34
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/04; H04J3/042
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2403527A
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US2447233A
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US2408063A
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US2416330A
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US2419340A
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US2498678A
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US2443198A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-21 | 1957-03-23 | 1957-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-21 | 1961-03-23 | 1961-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-21 | 1965-03-23 | 1965-09-22 | $7700.00 | Window Closed / Lapsed |