US2471101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secondary combustion air distribution control for bridge wall furnaces
Assignee: Individual
•
Filing: 1945-03-31
•
Granted: 1949-05-24
•
Expires: 1965-03-31
Abstract
No abstract record available.
Inventors
- 👤 Charles E Feinberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:40
CPC Classifications
F; F23; F23L; F23L9/00; F23L9/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1614237A
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US1630977A
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US1887891A
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US2072078A
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US2160481A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-23 | 1952-11-22 | 1953-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-23 | 1956-11-22 | 1957-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-23 | 1960-11-22 | 1961-05-24 | $7700.00 | Window Closed / Lapsed |