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Patent US2979556A successfully refreshed from Google Patents.
US2979556A
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US
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Semiautomatic teletypewriter tape relay system
Assignee: AT&T Inc
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Filing: 1956-10-02
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Granted: 1961-04-11
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Expires: 1976-10-02
Abstract
No abstract record available.
Inventors
- 👤 Russell J Anspach
- 👤 Robert C Clark
- 👤 James T Neiswinter
- 👤 Prospero A Tamasi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:43
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/54
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) | 1964-04-10 | 1964-10-10 | 1965-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-10 | 1968-10-10 | 1969-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-10 | 1972-10-10 | 1973-04-11 | $7700.00 | Window Closed / Lapsed |