US2582959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron-tube controlled switching system
Assignee: AT&T Inc
•
Filing: 1947-10-29
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Granted: 1952-01-22
•
Expires: 1967-10-29
Abstract
No abstract record available.
Inventors
- 👤 Bruce Edmond
- 👤 Nathan I Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:57
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/0004
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2326551A
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US2291224A
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US2291040A
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US2310452A
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US2350888A
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US2320076A
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US2326458A
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US2326478A
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US2317471A
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US2348626A
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US2434989A
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US2510062A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-01-21 | 1955-07-23 | 1956-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-21 | 1959-07-23 | 1960-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-21 | 1963-07-23 | 1964-01-22 | $7700.00 | Window Closed / Lapsed |