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US2663271A
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Fluid controlled alarm system for jails
Assignee: Individual
•
Filing: 1948-12-23
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Granted: 1953-12-22
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Expires: 1968-12-23
Abstract
No abstract record available.
Inventors
- 👤 Otto W Becker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:59
CPC Classifications
E; E04; E04H; E04H3/00; E04H3/08; Y; Y10; Y10T; Y10T70/00; Y10T70/80; Y10T70/8027; Y10T70/8216
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-21 | 1957-06-22 | 1957-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-21 | 1961-06-22 | 1961-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-21 | 1965-06-22 | 1965-12-22 | $7700.00 | Window Closed / Lapsed |