Patent US2839639A successfully refreshed from Google Patents.
US2839639A
Expired / Lapsed
US
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Thermal switch for fire alarms and the like
Assignee: SAMUEL LOKIN
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Filing: 1957-04-23
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Granted: 1958-06-17
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Expires: 1977-04-23
Abstract
No abstract record available.
Inventors
- 👤 Saul H Adlerstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:36
CPC Classifications
H; H01; H01H; H01H37/00; H01H37/02; H01H37/64; H01H37/66; G; G01; G01K; G01K5/00; G01K5/48; G01K5/56; G01K5/62; H01H37/32; H01H37/52; H01H1/00; H01H1/50; H01H1/54; H01H2001/545
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) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |