Patent US2449467A successfully refreshed from Google Patents.
US2449467A
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Communication system employing pulse code modulation
Assignee: AT&T Inc
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Filing: 1944-09-16
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Granted: 1948-09-14
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Expires: 1964-09-16
Abstract
No abstract record available.
Inventors
- 👤 William M Goodall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:41
CPC Classifications
H; H04; H04B; H04B14/00; H04B14/02; H04B14/04; H03; H03M; H03M1/00; H03M1/12; H03M1/50; H03M1/56; H03M1/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1461783A
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US1561227A
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US1709901A
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US1757181A
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US2266401A
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US2262838A
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US2272070A
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US2313209A
Cited
US2277000A
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US2413023A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-09-14 | 1952-03-15 | 1952-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-09-14 | 1956-03-15 | 1956-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-09-14 | 1960-03-15 | 1960-09-14 | $7700.00 | Window Closed / Lapsed |