US2444078A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trouble alarm system
Assignee: AT&T Inc
•
Filing: 1942-06-10
•
Granted: 1948-06-29
•
Expires: 1962-06-10
Abstract
No abstract record available.
Inventors
- 👤 Weaver Allan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:20
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1024444A
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US1877635A
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US2082465A
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US2111352A
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US2098910A
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US2082550A
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US2168786A
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US2122112A
Cited
US2269692A
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US2273231A
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US2355352A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-06-29 | 1951-12-29 | 1952-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-06-29 | 1955-12-29 | 1956-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-06-29 | 1959-12-29 | 1960-06-29 | $7700.00 | Window Closed / Lapsed |