US2581056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal transmission system
Assignee: British Telecommunications PLC
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Filing: 1949-05-11
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Granted: 1952-01-01
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Expires: 1969-05-11
Abstract
No abstract record available.
Inventors
- 👤 Walmsley Thomas
- 👤 Leigh Ronald Craig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:24
CPC Classifications
H; H04; H04Q; H04Q9/00; H04Q9/08
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) | 1954-12-31 | 1955-07-02 | 1956-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-31 | 1959-07-02 | 1960-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-31 | 1963-07-02 | 1964-01-01 | $7700.00 | Window Closed / Lapsed |