US2453461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Code modulation communication system
Assignee: AT&T Inc
•
Filing: 1946-06-19
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Granted: 1948-11-09
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Expires: 1966-06-19
Abstract
No abstract record available.
Inventors
- 👤 John C Schelleng
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:50
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/12; H03M1/34; H03M1/36; H03M1/361
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE647468C
Cited
US2272070A
Cited
US2313209A
Cited
US2282046A
Cited
US2403210A
Cited
US2430139A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-09 | 1952-05-10 | 1952-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-09 | 1956-05-10 | 1956-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-09 | 1960-05-10 | 1960-11-09 | $7700.00 | Window Closed / Lapsed |