US2656487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage supply control circuit
Assignee: AT&T Inc
•
Filing: 1950-06-29
•
Granted: 1953-10-20
•
Expires: 1970-06-29
Abstract
No abstract record available.
Inventors
- 👤 William O Fullerton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:28
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/52; H03F1/54; H03F1/546
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1813541A
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US1788513A
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US1816913A
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US1876320A
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US1893223A
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US1946607A
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US2017126A
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US2152472A
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US2555689A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-19 | 1957-04-20 | 1957-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-19 | 1961-04-20 | 1961-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-19 | 1965-04-20 | 1965-10-20 | $7700.00 | Window Closed / Lapsed |