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Patent US2679977A successfully refreshed from Google Patents.
US2679977A
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Calculator sign control circuit
Assignee: AT&T Inc
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Filing: 1946-12-17
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Granted: 1954-06-01
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Expires: 1966-12-17
Abstract
No abstract record available.
Inventors
- 👤 Ernest G Andrews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:19
CPC Classifications
G; G06; G06F; G06F7/00; G06F7/38; G06F7/40; G06F7/44; G06F7/446
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-31 | 1957-11-30 | 1958-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-31 | 1961-11-30 | 1962-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-31 | 1965-11-30 | 1966-06-01 | $7700.00 | Window Closed / Lapsed |