Patent US2767246A successfully refreshed from Google Patents.
US2767246A
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US
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Automatic message accounting system
Assignee: AT&T Inc
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Filing: 1952-01-04
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Granted: 1956-10-16
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Expires: 1972-01-04
Abstract
No abstract record available.
Inventors
- 👤 John B Retallack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:14
CPC Classifications
H; H04; H04M; H04M15/00; H04M15/38; G; G06; G06F; G06F7/00; G06F7/38; G06F7/40; G06F7/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2112951A
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US2486722A
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US2266215A
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US2289939A
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US2369868A
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US2297365A
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US2298519A
Cited
US2513112A
Cited
US2484612A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-16 | 1960-04-16 | 1960-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-16 | 1964-04-16 | 1964-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-16 | 1968-04-16 | 1968-10-16 | $7700.00 | Window Closed / Lapsed |