Patent US2642493A successfully refreshed from Google Patents.
US2642493A
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US
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Automatic message accounting system
Assignee: AT&T Inc
•
Filing: 1947-02-27
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Granted: 1953-06-16
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Expires: 1967-02-27
Abstract
No abstract record available.
Inventors
- 👤 George A Locke
- 👤 Weaver Allan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:59
CPC Classifications
H; H04; H04M; H04M15/00; H04M15/38; H04L; H04L5/00; H04L5/22; H04L5/24; H04L5/245; H04Q; H04Q1/00; H04Q1/18; H04Q1/30; H04Q1/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB357532A
Cited
US2394990A
Cited
US2210577A
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US2465355A
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US2451859A
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US2369662A
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US2400574A
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US2467257A
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US2409229A
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US2467929A
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US2444950A
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US2536578A
Cited
GB613084A
Cited
US2595712A
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US2585282A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-15 | 1956-12-15 | 1957-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-15 | 1960-12-15 | 1961-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-15 | 1964-12-15 | 1965-06-16 | $7700.00 | Window Closed / Lapsed |