Patent US2540287A successfully refreshed from Google Patents.
US2540287A
Expired / Lapsed
US
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Printing telegraph system and apparatus
Assignee: AT&T Teletype Corp
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Filing: 1947-06-04
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Granted: 1951-02-06
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Expires: 1967-06-04
Abstract
No abstract record available.
Inventors
- 👤 Martha W C Potts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:49
CPC Classifications
H; H04; H04L; H04L17/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1936956A
Cited
US2183559A
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US2114295A
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US2252232A
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US2380667A
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US2390664A
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US2397202A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |