US2915743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disaster warning system
Assignee: Individual
•
Filing: 1956-05-29
•
Granted: 1959-12-01
•
Expires: 1976-05-29
Abstract
No abstract record available.
Inventors
- 👤 Harold W Stewart
- 👤 Railsback Horace Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:03
CPC Classifications
G; G08; G08B; G08B27/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US958224A
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US2248784A
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US2319633A
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US2275147A
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US2348399A
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US2387444A
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US2498899A
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US2580539A
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US2647360A
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US2647253A
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US2756414A
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US2709801A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-30 | 1963-06-01 | 1963-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-30 | 1967-06-01 | 1967-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-30 | 1971-06-01 | 1971-12-01 | $7700.00 | Window Closed / Lapsed |