Patent US2550427A successfully refreshed from Google Patents.
US2550427A
Expired / Lapsed
US
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Magnetic recording and transmitting system
Assignee: AT&T Teletype Corp
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Filing: 1947-06-11
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Granted: 1951-04-24
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Expires: 1967-06-11
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 08:07
CPC Classifications
H; H04; H04L; H04L13/00; H04L13/02; H04L13/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1848799A
Cited
US1813908A
Cited
US1947249A
Cited
US2131322A
Cited
US2300463A
Cited
US2403009A
Cited
US2382251A
Cited
US2431646A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-23 | 1954-10-23 | 1955-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-23 | 1958-10-23 | 1959-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-23 | 1962-10-23 | 1963-04-24 | $7700.00 | Window Closed / Lapsed |