Patent US2287606A successfully refreshed from Google Patents.
US2447701A
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US
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Radio signaling circuit
Assignee: ELECTRONIC LAB Inc
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Filing: 1943-03-27
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Granted: 1948-08-24
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Expires: 1963-03-27
Abstract
No abstract record available.
Inventors
- 👤 Donald L Hings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:48
CPC Classifications
H; H03; H03C; H03C1/00; H03C1/16; H03C1/18; H03C1/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2053414A
Cited
US2008996A
Cited
US1999190A
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US2002209A
Cited
GB443803A
Cited
US2101438A
Cited
US2298629A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-08-24 | 1952-02-23 | 1952-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-24 | 1956-02-23 | 1956-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-24 | 1960-02-23 | 1960-08-24 | $7700.00 | Window Closed / Lapsed |