Patent US2412977A successfully refreshed from Google Patents.
US2412977A
Expired / Lapsed
US
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Flame sensitive device
Assignee: Robertshaw Thermostat Co
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Filing: 1943-11-19
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Granted: 1946-12-24
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Expires: 1963-11-19
Abstract
No abstract record available.
Inventors
- 👤 Samuel G Eskin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:37
CPC Classifications
F; F23; F23Q; F23Q5/00; F23N; F23N5/00; F23N5/02; F23N5/14; F24; F24C; F24C3/00; F24C3/12; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12806; Y10T428/12826; Y10T428/12847; Y10T428/12854
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1949-12-23 | 1950-06-24 | 1950-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-12-23 | 1954-06-24 | 1954-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-12-23 | 1958-06-24 | 1958-12-24 | $7700.00 | Window Closed / Lapsed |