US2489113A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic alarm switch
Assignee: Individual
•
Filing: 1947-05-21
•
Granted: 1949-11-22
•
Expires: 1967-05-21
Abstract
No abstract record available.
Inventors
- 👤 George L Veenstra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:09
CPC Classifications
G; G08; G08G; G08G1/00; G08G1/01; G08G1/042
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2240891A
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US2255187A
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US2397137A
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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) | 1952-11-21 | 1953-05-23 | 1953-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-21 | 1957-05-23 | 1957-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-21 | 1961-05-23 | 1961-11-22 | $7700.00 | Window Closed / Lapsed |