Patent US2448475A successfully refreshed from Google Patents.
US2448475A
Expired / Lapsed
US
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Safety control apparatus for fuel burners
Assignee: Robertshaw Controls Co
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Filing: 1942-10-27
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Granted: 1948-08-31
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Expires: 1962-10-27
Abstract
No abstract record available.
Inventors
- 👤 Charles K Strobel
- 👤 Stanley J Lakota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:45
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/02; F23N5/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US294669A
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US1142852A
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US1266642A
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US1666331A
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US1915566A
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US2085195A
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US2170497A
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US2296340A
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US2344178A
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US2366774A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-08-31 | 1952-03-01 | 1952-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-31 | 1956-03-01 | 1956-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-31 | 1960-03-01 | 1960-08-31 | $7700.00 | Window Closed / Lapsed |