Patent US2474941A successfully refreshed from Google Patents.
US2474941A
Expired / Lapsed
US
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Spark responsive burner control
Assignee: Cook Electric Co
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Filing: 1946-06-05
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Granted: 1949-07-05
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Expires: 1966-06-05
Abstract
No abstract record available.
Inventors
- 👤 Walter C Hasselhorn
- 👤 Eugene H Zlebold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:09
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/24; F23N5/245; F23N2231/00; F23N2231/18; F23N2235/00; F23N2235/12; F23N2235/18; F23N2235/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1599173A
Cited
US2010920A
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US2238892A
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US2196443A
Cited
US2181970A
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US2323767A
Cited
US2412990A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-07-04 | 1953-01-03 | 1953-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-07-04 | 1957-01-03 | 1957-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-07-04 | 1961-01-03 | 1961-07-05 | $7700.00 | Window Closed / Lapsed |