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Patent US2597026A successfully refreshed from Google Patents.
US2597026A
Expired / Lapsed
US
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Heated drum for warm air furnaces
Assignee: Individual
•
Filing: 1946-12-19
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Granted: 1952-05-20
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Expires: 1966-12-19
Abstract
No abstract record available.
Inventors
- 👤 Paul B Patton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:53
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US564402A
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US1762951A
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US1561161A
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US1698937A
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US2090053A
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US2373090A
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US2422694A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-05-20 | 1955-11-19 | 1956-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-20 | 1959-11-19 | 1960-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-20 | 1963-11-19 | 1964-05-20 | $7700.00 | Window Closed / Lapsed |