Patent US2417667A successfully refreshed from Google Patents.
US2417667A
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Safety control system for fuel burners
Assignee: Robertshaw Thermostat Co
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Filing: 1944-06-19
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Granted: 1947-03-18
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Expires: 1964-06-19
Abstract
No abstract record available.
Inventors
- 👤 Charles K Strobel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:57
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/20; Y; Y10; Y10T; Y10T137/00; Y10T137/1407
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1535240A
Cited
US1858265A
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US2005224A
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GB371002A
Cited
US2106249A
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US2171955A
Cited
US2297821A
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US2318195A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-03-17 | 1950-09-16 | 1951-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-03-17 | 1954-09-16 | 1955-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-03-17 | 1958-09-16 | 1959-03-18 | $7700.00 | Window Closed / Lapsed |