Patent US2455052A successfully refreshed from Google Patents.
US2455052A
Expired / Lapsed
US
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Signal receiving system
Assignee: AT&T Inc
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Filing: 1944-06-17
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Granted: 1948-11-30
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Expires: 1964-06-17
Abstract
No abstract record available.
Inventors
- 👤 Harold J Fisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:48
CPC Classifications
H; H03; H03J; H03J7/00; H03J7/18; H03J7/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1883907A
Cited
US1970424A
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US1994232A
Cited
US2084760A
Cited
US2273914A
Cited
US2279246A
Cited
US2312203A
Cited
US2409012A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-30 | 1952-05-31 | 1952-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-30 | 1956-05-31 | 1956-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-30 | 1960-05-31 | 1960-11-30 | $7700.00 | Window Closed / Lapsed |