Patent US2641206A successfully refreshed from Google Patents.
US2641206A
Expired / Lapsed
US
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Firetube baffle insert with protected tip for heat exchangers
Assignee: Individual
•
Filing: 1947-11-05
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Granted: 1953-06-09
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Expires: 1967-11-05
Abstract
No abstract record available.
Inventors
- 👤 Stout Minor Woolfolk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:39
CPC Classifications
F; F22; F22B; F22B37/00; F22B37/02; F22B37/06; F22B9/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2059523A
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US1388238A
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US1540535A
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US1875856A
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US1918935A
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US2035970A
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US2067133A
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US2379017A
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US2348901A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-08 | 1956-12-08 | 1957-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-08 | 1960-12-08 | 1961-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-08 | 1964-12-08 | 1965-06-09 | $7700.00 | Window Closed / Lapsed |