US2294905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power line telephone system
Assignee: AT&T Inc
•
Filing: 1941-04-19
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Granted: 1942-09-08
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Expires: 1961-04-19
Abstract
No abstract record available.
Inventors
- 👤 Richard K Honaman
- 👤 Dexter T Osgood
- 👤 Kenneth H Perkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:23
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/54; H04B3/544; H04B2203/00; H04B2203/54; H04B2203/5404; H04B2203/5416; H04B2203/5429; H04B2203/5437; H04B2203/545; H04B2203/5462; H04B2203/5483; H04B2203/5495
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1945-09-07 | 1946-03-09 | 1946-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-09-07 | 1950-03-09 | 1950-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-09-07 | 1954-03-09 | 1954-09-08 | $7700.00 | Window Closed / Lapsed |