US2654804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power line carrier telephone system
Assignee: AT&T Inc
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Filing: 1949-05-27
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Granted: 1953-10-06
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Expires: 1969-05-27
Abstract
No abstract record available.
Inventors
- 👤 Robert C Edson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:50
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/54; H04B2203/00; H04B2203/54; H04B2203/5429; H04B2203/5437
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-05 | 1957-04-06 | 1957-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-05 | 1961-04-06 | 1961-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-05 | 1965-04-06 | 1965-10-06 | $7700.00 | Window Closed / Lapsed |