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US2676586A
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Blackout-preventing device
Assignee: Individual
•
Filing: 1942-06-24
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Granted: 1954-04-27
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Expires: 1962-06-24
Abstract
No abstract record available.
Inventors
- 👤 Jr Charles A Coakwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:30
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/12; A61B17/132; A61B17/135; A61B17/1355
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US98859A
Cited
US1509743A
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US1887880A
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US2222886A
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US2104758A
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GB500270A
Cited
US2293889A
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US2228115A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-26 | 1957-10-26 | 1958-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-26 | 1961-10-26 | 1962-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-26 | 1965-10-26 | 1966-04-27 | $7700.00 | Window Closed / Lapsed |