Patent US3539991A successfully refreshed from Google Patents.
US3539991A
Expired / Lapsed
US
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Frequency responsive electronic lock mechanism
Assignee: RAGEN PRECISION IND Inc
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Filing: 1967-07-18
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Granted: 1970-11-10
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Expires: 1987-07-18
Abstract
No abstract record available.
Inventors
- 👤 Carlos A Irazoqui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:47
CPC Classifications
G; G07; G07F; G07F17/00; G07F17/24; G07C; G07C9/00; G07C9/00174; G07C9/00182; G07F7/00; G07F9/00; G07F9/06; G07C2009/00753; G07C2009/00761
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) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |