US2464607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulse code modulation communication system
Assignee: AT&T Inc
•
Filing: 1945-07-09
•
Granted: 1949-03-15
•
Expires: 1965-07-09
Abstract
No abstract record available.
Inventors
- 👤 John R Pierce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:18
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/66; H03M1/82; H03M1/822; H03M1/827
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1928093A
Cited
US2266401A
Cited
US2262838A
Cited
US2352634A
Cited
US2272070A
Cited
US2415329A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-03-14 | 1952-09-13 | 1953-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-03-14 | 1956-09-13 | 1957-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-03-14 | 1960-09-13 | 1961-03-15 | $7700.00 | Window Closed / Lapsed |