US2746028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air raid warning system
Assignee: AT&T Inc
•
Filing: 1952-08-05
•
Granted: 1956-05-15
•
Expires: 1972-08-05
Abstract
No abstract record available.
Inventors
- 👤 Albert E Bachelet
- 👤 James S Bomba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:53
CPC Classifications
G; G08; G08B; G08B27/00; G08B27/006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2315435A
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US2541558A
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US2471530A
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US2545894A
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US2623208A
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US2574458A
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US2602853A
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US2581056A
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US2577141A
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US2695399A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-15 | 1959-11-14 | 1960-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-15 | 1963-11-14 | 1964-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-15 | 1967-11-14 | 1968-05-15 | $7700.00 | Window Closed / Lapsed |