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US2492432A
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Electrical protective alarm system
Assignee: ADT Security Systems Inc
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Filing: 1946-07-27
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Granted: 1949-12-27
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Expires: 1966-07-27
Abstract
No abstract record available.
Inventors
- 👤 Herbert M Laford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:56
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US726292A
Cited
US1881832A
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US1840637A
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US1920742A
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US2224548A
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US2346171A
Cited
US2353452A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-26 | 1953-06-27 | 1953-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-26 | 1957-06-27 | 1957-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-26 | 1961-06-27 | 1961-12-27 | $7700.00 | Window Closed / Lapsed |