US2531846A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Communication system employing pulse code modulation
Assignee: AT&T Inc
•
Filing: 1947-03-13
•
Granted: 1950-11-28
•
Expires: 1967-03-13
Abstract
No abstract record available.
Inventors
- 👤 William M Goodall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:47
CPC Classifications
H; H04; H04B; H04B14/00; H04B14/02; H04B14/04; H04B14/046; H04B14/048
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE647468C
Cited
US2061734A
Cited
US2186895A
Cited
US2272070A
Cited
US2413440A
Cited
US2416306A
Cited
US2458734A
Cited
US2413023A
Cited
US2430139A
Cited
US2453461A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-27 | 1954-05-29 | 1954-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-27 | 1958-05-29 | 1958-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-27 | 1962-05-29 | 1962-11-28 | $7700.00 | Window Closed / Lapsed |