US2506955A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tunable high-frequency circuits
Assignee: AT&T Inc
•
Filing: 1945-05-14
•
Granted: 1950-05-09
•
Expires: 1965-05-14
Abstract
No abstract record available.
Inventors
- 👤 Renato D Fracassi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:57
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/16; H01J23/18; H01J23/20; H01J23/213
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2167201A
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US2109880A
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GB509102A
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US2242275A
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US2251085A
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US2259690A
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US2272211A
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US2408234A
Cited
US2422465A
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US2408903A
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US2444080A
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US2424496A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-08 | 1953-11-07 | 1954-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-08 | 1957-11-07 | 1958-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-08 | 1961-11-07 | 1962-05-09 | $7700.00 | Window Closed / Lapsed |