US2640914A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Duplex telegraphy system utilizing band compression
Assignee: AT&T Teletype Corp
•
Filing: 1948-11-05
•
Granted: 1953-06-02
•
Expires: 1968-11-05
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:03
CPC Classifications
H; H03; H03M; H03M5/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1953658A
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US2074037A
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US2053092A
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US2199179A
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US2281745A
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US2463503A
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US2437027A
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US2380542A
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US2462112A
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US2471126A
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US2813980A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |